基于原生js和flex布局开发侧边栏

 1 body{
 2     padding: 0 10%;
 3 }
 4 ul,li{
 5     margin: 0;
 6     padding: 0;
 7     list-style: none;
 8 }
 9 .flex-box{
10     display: flex;
11     border: 1px solid;
12 }
13 .flex-left{
14     width: 200px;
15     text-align: center;
16     background: peru;
17 }
18 .flex-right{
19     flex-grow: 1;
20 }
21 .flex-left li{
22     height: 60px;
23     line-height: 60px;
24     font-size: 18px;
25     border-bottom: 1px solid;
26 }
27 .flex-left li:last-child{
28     border-bottom: none;
29 }
30 .active{
31     background: #8b8bde;
32 }
33 .hide{
34     display: none;
35 }

 1 <div class="flex-box">
 2     <div class="flex-left">
 3         <ul>
 4             <li class="li-node active">标题一</li>
 5             <li class="li-node">标题二</li>
 6             <li class="li-node">标题三</li>
 7             <li class="li-node">标题四</li>
 8         </ul>
 9     </div>
10     <div class="flex-right">
11         <div class="div-node">页面1</div>
12         <div class="div-node hide">页面2</div>
13         <div class="div-node hide">页面3</div>
14         <div class="div-node hide">页面4</div>
15     </div>
16 </div>

 1 <script>
 2     window.onload = function() {
 3         var liArr = document.getElementsByClassName(‘li-node‘);
 4         var divArr = document.getElementsByClassName(‘div-node‘);
 5         console.log(liArr);
 6         console.log(divArr);
 7         for(var i=0;i<liArr.length;i++){
 8         (function(i) {
 9             liArr[i].onclick = function(){
10                 changeClass();
11                 liArr[i].className = "li-node active";
12                 divArr[i].className = "div-node";
13             }
14         })(i)
15         }
16         var changeClass = function(){
17         for(var i=0;i<liArr.length;i++){
18             (function(i) {
19                 liArr[i].className = "li-node";
20                 divArr[i].className = "div-node hide";
21             })(i)
22         }
23         }
24     }
25 </script>