lovecoding
/
W260426


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        li{
            list-style: none;
        }
        .box{
            width: 600px;
            height: 100px;
            background-color: #999;
            margin:100px auto;
        }
        .box ul{
            display: flex;
        }
        .box li{
            width: 200px;
            height: 100px;
            font-size: 50px;
            font-weight: bold;
            text-align: center;
            line-height: 100px;
            color: white;
        }
        .box ul .active{
            background-color: #111;

        }
    </style>
</head>
<body>
    <div class="box">
        <ul>
            <li class="active">first</li>
            <li>second</li>
            <li>thrid</li>
        </ul>
    </div>
    <script>
        var lis = document.querySelectorAll("li");

        // 循环绑定事件
        for(var i=0;i<lis.length;i++){
            lis[i].onclick = function(){
                for(var j=0;j<lis.length;j++){
                    lis[j].classList.remove("active");
                }
                this.classList.add("active");
            }
        }
    </script>
</body>
</html>