Js实现原生二级菜单

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>二级菜单</title>
    <style>
        span{
            background-color: pink;
        }
        #menu{
            background-color: orange;
            width: 90px;
            font-size: 30px;
            text-align: center;
            cursor: pointer;
            margin: auto;
            margin-top: 100px;
        }
        .fold{
            height: 30px;
            overflow: hidden;
        }
        a{
            font-size: 20px;
        }
    </style>
   
</head>
<body>
    <div id="menu">
        <div class="fold"><span>羊村</span>
            <br>
            <a href="#">喜羊羊</a><br>
            <a href="#">美羊羊</a><br>
            <a href="#">懒羊羊</a><br>
            <a href="#">懒羊羊</a><br>
        </div>
        <div class="fold"><span>羊村</span>
            <br>
            <a href="#">喜羊羊</a><br>
            <a href="#">美羊羊</a><br>
            <a href="#">懒羊羊</a><br>
            <a href="#">美羊羊</a><br>
            <a href="#">懒羊羊</a><br>
        </div>
        <div class="fold"><span>羊村</span>
            <br>
            <a href="#">喜羊羊</a><br>
            <a href="#">美羊羊</a><br>
            <a href="#">懒羊羊</a><br>
            <a href="#">喜羊羊</a><br>
            <a href="#">美羊羊</a><br>
            <a href="#">懒羊羊</a><br>
        </div>
    </div>
</body>
<script src="./tools.js"></script>
<script>
var spans = document.getElementsByTagName('span'); //获取span标签
var opendiv = spans[0].parentNode;
removeClass(opendiv,'fold');

 for(var i = 0; i < spans.length; i++){
    spans[i].onclick = function(){
        var clickdiv = this.parentNode;
       // alert(clickdiv);
        menutoggle(clickdiv);
       // toggleClass(clickdiv,'fold');
        if(opendiv!=clickdiv && !hasClass(opendiv,'fold')){
            //addClass(opendiv,'fold');
            //toggleClass(opendiv,'fold');
            menutoggle(opendiv);
        }
        opendiv = clickdiv;

    }
}
/* 定义菜单切换以及动画效果 */ 
function menutoggle(obj){
    //在切换样式之前元素的高度
    var begin = obj.offsetHeight;
    //切换样式
    toggleClass(obj,'fold');
    //切换之后的高度
    var end = obj.offsetHeight;
    //将元素样式切换到变化前，来设置动画效果
    obj.style.height = begin + 'px';
    obj.style.overflow = 'hidden';
    move(obj,'height',end,10,function(){
        obj.style.height = ""; //内联样式取消，防止影响下次触发动画样式不变
    });

}

</script>

</html>
Js实现原生二级菜单

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