03 视图

Flask支持FBV、CBV两种模式，这里先聊FBV

指定HTTP方法

@app.route("路由", methods=["请求方法"]) 
GET请求 
request.args.get("xx") 
POST请求 
request.form.get("xxx")

from flask import Flask, request
app = Flask(__name__)
# 默认都是接受GET请求
@app.route("/login/", methods=['GET', 'POST'])
def login():
    # GET    参数直接在URL中
    # POST   参数没有直接体现在URL地址中
    print(request.args)
    # GET请求接受参数
    # print(request.args.get('username'))
    # POST请求接受参数
    # print(request.form.get("name"))
    return "login"

重定向

return redirect(url_for("函数名字"))

• 301 永久
• 302 暂时 ```python from flask import Flask, request, redirect app = Flask(name)

@app.route(“/profile/“) def profile(): name = request.args.get(“name”)

if name:
    return name
else:
    # 重定向到登陆页面
    return redirect(url_for("login"), code=301)

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## 函数的返回值
字符串<br />`return "字符串" `<br />元组<br />`return "字符串", 状态码 `<br />Response<br />`return Response("字符串", "状态码", mimetype="") `<br />make_response<br />`make_response("字符串")`<br />可以使⽤make_response函数来创建Response对象，这个⽅法可以设置额外的 <br />数据，⽐如设置cookie，header信息 
```python
from flask import Flask, redirect, Response, make_response
app = Flask(__name__)
@app.route("/about/")
def about():
    # return "juran"
    # return ['123']
    # return {"name": "juran"}
    # return ('name', "python")[1]
    # return (["python"], "java")
    return Response("关于我们", status=200, mimetype="text/html")
    # return "关于我们", 200
    # return make_response("关于我们")

add_url_rule

from flask import Flask, render_template, url_for
app = Flask(__name__)
@app.route('/')
def index():
    print(url_for('profilePage'))  # /profile/
    return '首页'
def profile():
    print(url_for('FirstPage'))
    return render_template("profile/user.html")
# 添加URL规则
app.add_url_rule("/profile/", endpoint='profilePage', view_func=profile)  # endpoint别名