<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>表格全选、全不选,反选</title> <style> table{ border: 1px solid; width: 500px; margin-left: 30%; } td,th{ text-align: center; border: 1px solid; } div{ margin-top: 10px; margin-left: 30%; } .out{ background-color: white; } .over{ background-color: pink; } </style> <script> /* 分析: 1.全选: * 获取所有的checkbox * 遍历cb,设置每一个cb的状态为选中 checked */ //1、在页面加载完成后绑定事件 window.onload = function () { //2、给全选按钮绑定单击事件 document.getElementById("selectAll").onclick = function () { //全选 //1、获取所有的checkbox let cbs = document.getElementsByName("cb"); //2、遍历 for (let i = 0; i < cbs.length; i++) { //3、设置每一个cb的状态为选中 checked cbs[i].checked = true; } }; document.getElementById("unSelectAll").onclick = function () { //全选 //1、获取所有的checkbox let cbs = document.getElementsByName("cb"); //2、遍历 for (let i = 0; i < cbs.length; i++) { //3、设置每一个cb的状态为选中 checked cbs[i].checked = false; } }; document.getElementById("selectRev").onclick = function () { //反选 //1、获取所有的checkbox let cbs = document.getElementsByName("cb"); //2、遍历 for (let i = 0; i < cbs.length; i++) { //3、设置每一个cb的状态为相反 cbs[i].checked = !cbs[i].checked; } }; document.getElementById("firstCb").onclick = function () { //点击第一个复选框cb //1、获取所有的checkbox let cbs = document.getElementsByName("cb"); //2、遍历 for (let i = 0; i < cbs.length; i++) { //3、设置每一个cb的状态和第一个cb的状态一样 cbs[i].checked = this.checked; } }; //给所有tr绑定鼠标移到元素之上和移出元素事件 let trs = document.getElementsByTagName("tr"); //2、遍历 for (let i = 0; i < trs.length; i++) { //移到元素之上 trs[i].onmouseover = function () { this.className = "over"; }; //移出元素 trs[i].onmouseout=function () { this.className = "out"; } } }; </script> </head> <body> <table> <caption>学生信息表</caption> <tr> <th><input type="checkbox" name="cb" id="firstCb"></th> <th>编号</th> <th>姓名</th> <th>性别</th> <th>操作</th> </tr> <tr> <td><input type="checkbox" name="cb" ></td> <td>1</td> <td>张三丰</td> <td>男</td> <td><a href="javascript:void(0);">删除</a></td> </tr> <tr> <td><input type="checkbox" name="cb" ></td> <td>2</td> <td>张翠山</td> <td>男</td> <td><a href="javascript:void(0);">删除</a></td> </tr> <tr> <td><input type="checkbox" name="cb" ></td> <td>3</td> <td>张无忌</td> <td>?</td> <td><a href="javascript:void(0);">删除</a></td> </tr> </table> <div> <input type="button" id="selectAll" value="全选"> <input type="button" id="unSelectAll" value="全不选"> <input type="button" id="selectRev" value="反选"> </div> </body> </html>