3.JS基础 - 3.30-day3-js运算符 - 《Web 前端资料》

一、运算符
1.2 比较运算符：
1.3 比较运算符的细节
2.1 逻辑运算符
2.3 短路运算
- 2.3逻辑运算符里的短路
- 逻辑与短路
三、流程控制
四、流程控制小结
五、术语解释

理解什么是流程控制，知道条件控制的种类并掌握其对应的语法规则，知道JavaScript的常见术语。

掌握 if/else 条件控制的语法规则，并能处理简单逻辑
掌握 switch/case 条件控Set WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
Next制的语法规则，并能处理简单逻辑
掌握三元表达式的语法规则，并能处理简单逻辑
掌握比较运算符、逻辑运算符的使用
知道 == 与 === 的区别
掌握短路运算的使用
了解语言编程中常见术语

一、运算符

掌握比较运算符和逻辑运算符的使用，知道什么是短路运算

Set WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
NextSet WshShell= WScript.CreateObject(“WScript.shell”)
wshShell.AppActivate”仙人掌”
for i=1 to 9999999999999
WScript.sleep 100
WshShell.SendKeys “^v”
WshShell.SendKeys “%s”
Next1.1 比较运算符

比较运算符的介绍
- 作用：比较两个数据大小、是否相等

1.2 比较运算符：

   <script>
        //> <  >= <=   ==  ===  !=  !==  比较运算符的结果是布尔值  true  或者  false
        console.log(12 > 5);     //true
        console.log(12 < 5);    //false
        console.log(6 >= 5);    //true
        console.log(5 >= 5);    //true
        console.log(6 <= 5);    //false
        console.log(5 <= 5);    //true
        // ==相等只是比较内容是否相等，内容相等就是true，不比较数据类型
        console.log(7 == 7);    // true
        console.log('7' == 7);   // true
        // === 全等比较数据类型和内容，必须完全一致，才是true，否则就是false
        console.log(8 === 8);   // true
        console.log('8' === 8);  // false
        // != 不比较数据类型，只要内容相等，就是false，内同不相等，就是true
        console.log(6 != 7);  //true
        console.log(6 != 6);    // false
        console.log('6' != 6);  // false
        console.log('8' != 5); //true
        //!==全不等数据类型和内容只要有一个不一致，就是true，否则就是false
        console.log(6 !== 7);//true
        console.log(6 !== 6);// false
        console.log('6' !== 6);// true
    </script>

1.3 比较运算符的细节

字符串比较，是比较的字符对应的ASCII码
1. 从左往右依次比较
2. 如果第一位一样再比较第二位，以此类推
3. 比较的少，了解即可
NaN不等于任何值，包括它本身
- 用isNaN函数判断是否为NaN
尽量不要比较小数，因为小数有精度问题
不同类型之间比较会发生隐式转换
1. 最终把数据隐式转换转成number类型再比较
2. 所以开发中，如果进行准确的比较我们更喜欢 === 或者 !==

<script>
  let num = '10';
  let num1 = 10;
  // 不会产生隐式数据类型转换，即不但值大小相等，数据类型必须一致
  console.log(num === num1); // false
  console.log(num !== num1); // true
  let bool = true;
  let fool = 1;
  console.log(bool === fool); // false
</script>

2.1 逻辑运算符

逻辑运算符一般是将多个表达式的值组合起来，再次运算产生的新的表达式的值，逻辑运算主要分3种情形：

2.1-1逻辑且

它的特征是所联接的所有数据值均为 true，则结果为 true，任意 1 个为 false，则结果为 false。

&& 逻辑与并且两边都是true,与运算的结果就是true，只要有一个是false，与运算的结果就是false

 console.log(5 > 3 && 8 < 10);   // true
        console.log(5 < 3 && 8 < 10);   //false

2.1-2逻辑或

它的特征是所联接的所有数据值任意 1 为 true，则结果为 true，所有数据值均为 false，则结果为 false。

逻辑或或两边只要有一个true，与运算的结果就是true，两边都是false，结果就是false

 console.log(5 > 3 || 12 < 6);   // true
        console.log(5 > 3 || 12 > 6);   // true
        console.log(5 < 3 || 12 < 6);    //false

2.1-3逻辑非

它的特征是将当前数据的值强制转成相反的布尔值，如将 true，变成 false ，将 false，变成 true。

逻辑非取反真变假假变真

        console.log(!true);//false
        console.log(!false);  //true    
        console.log(!(3 > 5))//true    
        console.log(!(3 < 5))   //false

2.3 短路运算

目标:能说出短路运算符的运算规则

2.3逻辑运算符里的短路

存在于&&和│|中，当满足一定条件会让右边代码不执行 | 符号 | 短路条件 | | :—-: | :—-: | | && | 左边为false就短路 | | | | | 左边为true就短路 |

原因:通过左边能得到整个式子的结果，因此没必要再判断右边
运算结果:无论&&还是│，运算结果都是最后被执行的表达式值，一般用在变量赋值

console. log(false && 20)     //false
console.log(5<3 && 20)      // false
console.log (undefined && 20)    // undefined
console.log(nul1 8&20)     // null
console.log(0 &8 20)     //0
console.log(108& 20)    // 20

逻辑与短路

 <script>
        //逻辑与短路   一假则假，如果左边是false  右边不用管了，与运算的结果就是false
        console.log(false && 3);  //false 
        console.log(5 < 3 && document.write('哈哈哈'));  //false
        console.log(0 && 20);   //0
        console.log(null && 20); //null
        //逻辑或短路，一真则真，如果左边是true，或运算的结果就是true
        console.log(true || 100);// true
        console.log(12 > 3 || 11111);// true
        console.log(e || 23);// 23
        console.log(null || 34);//=34
    </script>

案例：短路运算用在函数传参的完整性

 let x = prompt('请输入x的值')
        let y = prompt('请输入y的值')
        function getSum(x, y) {
            x = x || 0
            y = y || 0
            return x + y
        }
        let sum = getSum(x, y)
        console.log(sum)

三、流程控制

目标:掌握流程控制,写能“思考”的程序

学习路径:
1. 程序三大流程控制
2. if语句
3. switch语句
4. 三元表达式

3.2 if语句

if(条件){
满足条件要执行的代码
} else {
不满足条件执行的代码
}

let age = +prompt('请输入年龄')
        if (age >= 18) {
            alert('请尽情玩耍')
        } else {
            alert('康鑫小屁孩，回家洗洗睡觉')
        }

案例~闰年平年案例

 let year = +prompt('请输入年份')
        function isLeaYear(y) {
            if (y % 4 === 0 && y % 100 !== 0 || y % 400 === 0) {
                return '闰年'
            } else {
                return '平年'
            }
        }
        let res = isLeaYear(year)
        document.write(res)

●多分支if语法:

if(条件1){
    代码1
    }else if(条件2）{
    代码2
   }else if（条件3){ 
    代码3   
    }else {
    代码n   
    }

释义:
- 先判断条件1，若满足条件1就执行代码1，其他不执行
- 若不满足则向下判断条件2，满足条件2执行代码2，其他不执行
- 若依然不满足继续往下判断，依次类推
- 若以上条件都不满足，执行else里的代码n
- 注:可以写N个条件，但这里演示只写2个

//用户输入分数，90以上奖励法拉利，70以上奖励大众、60以上奖励奇瑞、60以下打一顿
<script>
        let a = +prompt('请输入分数')
        if (a >= 90) {
            alert('奖励法拉利')
        } else if (a >= 70) {
            alert('奖励大众')
        }
        else if (a >= 60) {
            alert('奖励奇瑞')
        }
        else {
            alert('毒打一顿')
        }
    </script>

3.3 switch语句

释义:
- 找到跟小括号里数据全等的case值，并执行里面对应的代码
- 若没有全等的则执行default里的代码
- 例:数据若跟值2全等，则执行代码2

switch和 if else if 区别;1/ 1.大部分是通用的
如果有条件判断的,建议用if else if
如果值是固定的，建议 switch switch 效率更好

 // 多分支语句
        // switch(数据){1/case值1日}
        //如果数据和值1全等, 执行该处代码, 如果不全等，该处代码不执行 
        //break; 阻断向下执行
        // case值2:
        //如果数据和值2全等, 执行该处代码, 如果不全等，该处代码不执行
        //break; 阻断向下执行case 值n:
  //如果数据和值n全等，执行该处代码, 如果不全等, 该处代码不执行break;default:
        // 如果数据和上边case后边的值都不全等, 执行该处代码
        //1. switch和 if else if 区别;1/ 1.大部分是通用的
        // 2．如果有条件判断的,建议用if else if
        // 3．如果值是固定的，建议 switch switch 效率更好
let week = +prompt('请输入周几')
        switch (week) {
            case 1: alert('星期一')
                break
            case 2: alert('星期二')
                break
            case 3: alert('星期三')
                break
            case 4: alert('星期四')
                break
            case 5: alert('星期五')
                break
            case 6: alert('星期六')
                break
            case 7: alert('星期日')
                break
            default: alert('请输入1-7')
                break
        }

3.4三元表达式

也是双分支
符号:?与:配合使用
语法:
- 条件?满足条件执行的代码:不满足条件执行的代码
一般用来取值
案例:判断两个数谁是更大数

//三元表达条件 ？ 条件为true执行的代码：条件为false执行的代码
        //用户输入2个数，判断那个数更多大
        let num1 = +prompt('请输入第一个数')
        let num2 = +prompt('请输入第二个数')
       /*  if (num1 > num2) {
            alert(`num1的${num1}比较大`)
        } else {
            alert(`num2的${num2}比较大`)
        } */
        num1 > num2 ? alert(`num1的${num1} 比较大`) : alert(`num2的${num2} 比较大`)

案例:数字补0案例

<script>
        // 需求是0-59，当用户输入的是0-9的时候，前边补0
        let a = +prompt('请输入数字')
        // a <= 9 ? alert('0' + a) : alert(a)
        a = a <= 9 ? '0' + a : a
        document.write(a)
        console.log(a)
    </script>

四、流程控制小结

目标:掌握流程控制,写出能“思考”的程序

程序三大流程控制是?
- 三种形式
- 顺序分支
- 循环
if语句
switch语句
- 全等判断
- break:结束switch语句，防止穿透
- 穿透可合理利用
三元表达式
- 也是双分支
- 一般湖来取值

五、术语解释

目标:知道一些术语，让自己更专业

术语	解释	举例
关键字	在JavaScript中有特殊意义的词汇	let、var、function、if、else、switch、 case、break
保留字	在目前的JavaScript中没意义，但未来可能会具有特殊意义的词汇	int、 short、long、char
标识（标识符)	能产生值的代码，一般配合运算符出	无
表达式	能产生值的代码，一般配合运算符出现	10 + 3、age >= 18
语句	一句代码也称之为一条语句，一般按用途还会分类:输出语句、声明语句、分支语句	无

3.30-day3-js运算符