控制语句

1. 如果你的控制语句 (if, while 等) 太长或者超过了一行最大长度的限制，则可以将每个条件（或组）放入一个新的行。 逻辑运算符应该在行的开始 ```javascript // bad if ((foo === 123 || bar === ‘abc’) && doesItLookGoodWhenItBecomesThatLong() && isThisReallyHappening()) { thing1(); }

// bad if (foo === 123 && bar === ‘abc’) { thing1(); }

// bad if (foo === 123 && bar === ‘abc’) { thing1(); }

// bad if ( foo === 123 && bar === ‘abc’ ) { thing1(); }

// good if ( foo === 123 && bar === ‘abc’ ) { thing1(); }

// good if ( (foo === 123 || bar === ‘abc’) && doesItLookGoodWhenItBecomesThatLong() && isThisReallyHappening() ) { thing1(); }

// good if (foo === 123 && bar === ‘abc’) { thing1(); }

2. 不要使用选择操作符代替控制语句
```javascript
// bad
!isRunning && startRunning();
// good
if (!isRunning) {
  startRunning();
}