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@@ -0,0 +1,86 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+<style>
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+ * {
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+ margin: 0;
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+ padding: 0;
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+ }
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+
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+ li {
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+ list-style: none;
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+ }
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+
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+ ul {
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+ display: flex;
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+ }
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+
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+ li {
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+ width: 200px;
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+ height: 100px;
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+ color: white;
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+ background-color: gray;
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+ line-height: 100px;
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+ text-align: center;
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+ font-size: 40px;
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+ font-weight: bold;
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+ }
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+
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+ .active {
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+ background-color: black;
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+ }
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+ </style>
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+</head>
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+
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+<body>
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+ <!-- 第一步实现样式 -->
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+ <div>
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+ <ul>
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+ <!-- 添加自定义属性 data-index 来存储索引 -->
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+ <li data-index="0" class="active">first</li>
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+ <li data-index="1">second</li>
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+ <li data-index="2">third</li>
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+ </ul>
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+ </div>
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+ <script>
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+ // 第二步绑定事件
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+ var aLi = document.querySelectorAll("li");
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+
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+ // 循环绑定事件
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+ for(var i=0;i<aLi.length;i++){
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+ aLi[i].onclick = function(){
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+ // 移除所有选中状态
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+ for(var j=0;j<aLi.length;j++){
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+ aLi[j].classList.remove("active");
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+ }
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+ // 为自己 （当前点击的按钮）添加状态
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+ this.classList.add("active");
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+
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+ //添加历史记录
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+ // 获取自定义属性 data-index的值
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+ var dataIndex = this.dataset.index;
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+ // 把索引存储到历史记录中
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+ history.pushState(dataIndex,"");
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+ }
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+ }
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+ // 第三步监听历史变化
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+ window.onpopstate = function(){
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+ var historyState = history.state;
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+ // 将获取的state值转换为数字
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+ historyState = parseInt(historyState);
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+
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+ // 移除所有选中状态
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+ for(var j=0;j<aLi.length;j++){
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+ aLi[j].classList.remove("active");
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+ }
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+
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+ // 控制对应li添加选中状态
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+ aLi[historyState].classList.add("active");
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+
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+ }
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+ </script>
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+</body>
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+</html>
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