lovecoding
/
W250913


			
				
					
						
						
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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;
            margin:100px auto;
        }
        .box ul{
            display: flex;
        }
        .box li{
            width: 200px;
            height: 100px;
            background-color: #aaa;
            font-size: 50px;
            line-height: 100px;
            text-align: center;
            color: #fff;
        }
        .box .active{
            background-color: #111;
        }
    </style>
</head>

<body>
    <div class="box">
        <ul>
            <li class="active" data-id="first">first</li>
            <li data-id="second">second</li>
            <li data-id="third">third</li>
        </ul>
    </div>
    <script>
        var aLi = document.querySelectorAll("li");

        //定义函数处理选中状态
        function handleActive(key){
            
            for(var i=0;i<aLi.length;i++){
                if(aLi[i].dataset.id == key){
                    aLi[i].classList.add("active");
                }else{
                    aLi[i].classList.remove("active");
                }
                
            }

           
        }

        // 绑定标签按钮点击事件
        for(var i=0;i<aLi.length;i++){
            aLi[i].onclick = function(){
                var _id = this.dataset.id;
                // 调用处理选中状态函数
                handleActive(_id);
                // 添加历史记录
                history.pushState(_id,"");
            }
        }

        // 监听history变化
        window.onpopstate = function(event){
            var _state = event.state;
            console.log(_state);
            // 调用处理选中状态函数
            // handleActive(_state);
            if(_state){
                handleActive(_state);
            }else{
                handleActive(aLi[0].dataset.id);
            }

        }
    </script>
</body>

</html>