后台管理左侧菜单收缩自如 

<<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .hide{
            display: none;
        }
        .item .header{
            height: 35px;
            background-color: #2459a2;
            color: white;
            line-height: 35px;
        }
		.item .header:hover{
            height: 35px;
            background-color: black;
            color: yellow;
            line-height: 35px;
        }
    </style>
</head>
<body>
    <div style="height: 48px"></div>

    <div style="width: 300px">

        <div class="item">
            <div id='i1' class="header" onclick="ChangeMenu('i1');">菜单1</div>
            <div class="content">
                <div>内容1</div>
                <div>内容1</div>
                <div>内容1</div>
            </div>
        </div>
        <div class="item">
            <div id='i2' class="header" onclick="ChangeMenu('i2');">菜单2</div>
            <div class="content hide">
                <div>内容2</div>
                <div>内容2</div>
                <div>内容2</div>
            </div>
        </div>
        <div class="item">
            <div id='i3' class="header" onclick="ChangeMenu('i3');">菜单3</div>
            <div class="content hide">
                <div>内容3</div>
                <div>内容3</div>
                <div>内容3</div>
            </div>
        </div>
        <div class="item">
            <div id='i4' class="header" onclick="ChangeMenu('i4');">菜单4</div>
            <div class="content hide">
                <div>内容4</div>
                <div>内容4</div>
                <div>内容4</div>
            </div>
        </div>



    </div>

    <script>
        function ChangeMenu(nid){
            var current_header = document.getElementById(nid);

            var item_list = current_header.parentElement.parentElement.children;

            for(var i=0;i<item_list.length;i++){
                var current_item = item_list[i];
                current_item.children[1].classList.add('hide');
            }

            current_header.nextElementSibling.classList.remove('hide');
        }
    </script>
</body>
</html>

　　实现菜单的收缩自如

 1 function ChangeMenu(nid){
 2             var current_header = document.getElementById(nid);
 3             console.log(current_header.nextElementSibling.className.indexOf('hide'));
 4             if(current_header.nextElementSibling.className.indexOf('hide') < 0){
 5                 current_header.nextElementSibling.classList.add('hide');
 6                 return}
 7             var item_list = current_header.parentElement.parentElement.children;
 8 
 9             for(var i=0;i<item_list.length;i++){
10                 var current_item = item_list[i];
11                 current_item.children[1].classList.add('hide');
12             }
13 
14             current_header.nextElementSibling.classList.remove('hide');
15         }
indexOf比较

 

posted @ 2018-04-22 19:51  梦中琴歌  阅读(1093)  评论(0)    收藏  举报