原生实现点击li变颜色

实现简单的点击li变颜色

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>demo</title>
    <style>
        *{margin:0; padding:0;}
        li{list-style: none;}
        ul{
            width: 202px;
            margin: 0 auto;
            background: #1A9096;
        }
        li{
            width:200px;
            height:50px;
            text-align: center;
            line-height: 50px;
            margin-bottom: 10px;
            color: #fff;
            box-shadow:0px 6px 10px #0F545B inset;
            background: linear-gradient(to left, #1A9096 , #0D5A67);
        }
        .selected{
            background: linear-gradient(to left, #027DB4 , #0A4D64);
        }
    </style>
</head>
<body>
    <ul>
        <li>
            <span>我爱你</span>
        </li>
        <li>
            <span>我爱你</span>
        </li>
        <li>
            <span>我爱你</span>
        </li>
        <li>
            <span>我爱你</span>
        </li>
    </ul>
    <script>
        d=document.getElementsByTagName('li')
        console.log(d)
        for(var i=0;i<d.length;i++){
            d[i].index=i;
            d[i].onclick=function(){
            for(var j=0;j<d.length;j++){
            d[j].className='';//取消菜单样式
            }
            d[this.index].className='selected';
            }
        }
    </script>
</body>
</html>
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