登录（7天不用密码）

 1 script src="../cookie.js"></script>
 2 <script>
 3 
 4     class Remember{
 5         constructor(){
 6             this.user = document.getElementById("user");
 7             this.pass = document.getElementById("pass");
 8             this.remember = document.getElementById("remember");
 9             this.btn = document.getElementById("btn");
10 
11             this.init()
12             this.getUser();
13         }
14         init(){
15             var that = this;
16             this.btn.onclick = function(){
17                 if(that.remember.checked){
18                     // 存cookie
19                     that.setCookie()
20                 }else{
21                     // 删cookie
22                     that.removeCookie()
23                 }
24             }
25         }
26         setCookie(){
27             var data = {
28                 u:this.user.value,
29                 p:this.pass.value
30             }
31             setCookie("info",JSON.stringify(data),{
32                 expires:7
33             })
34         }
35         getUser(){
36             this.info = JSON.parse(getCookie("info"))
37             this.user.value = this.info.u;
38             this.pass.value = this.info.p;
39         }
40         removeCookie(){
41             removeCookie("info");
42         }
43     }
44 
45     new Remember;
46 
47 </script>

body页面

1 <body>
2     用户名：<input type="text" id="user"><br>
3     密码：<input type="text" id="pass"><br>
4     <label for="remember"><input type="checkbox" id="remember">记住密码七天</label>
5     <input type="button" id="btn" value="登录">
6 </body>