话不多说，附上源码，仅供大家参考
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> <script src="https://www.jb51.net/Scripts/jquery-1.10.2.js"></script> <script type="text/javascript"> var numArray = new Array(); var personNum = 30; $(function () { for (var i = 0; i < personNum; i++) { numArray[i] = i; } $("li").click(function () { var n = Math.floor(Math.random() * numArray.length + 1) - 1; //生成随机数 $(this).text(numArray[n]); numArray.splice(n, 1); //移除随机数 }); $("#btnStart").click(function () { var totalArray = new Array(); $("li").each(function (i, v) { totalArray[i] = v.innerText; }); var n = Math.floor(Math.random() * totalArray.length + 1) - 1; //生成随机数 this.value = totalArray[n]; $("li").each(function (i, v) { if (v.innerText == $("#btnStart").val()) { this.style.background = "red"; } else { this.style.background = "white"; } }); }); }); </script> <style type="text/css"> ul { /*display: block; float:left;*/ } ul li { width: 150px; height: 150px; line-height: 150px; border: 1px solid gray; float: left; margin-left: 10px; margin-top: 10px; list-style-type: none; text-align: center; font-size: 20px; } #btnStart { width: 100px; height: 30px; margin-left: 10px; margin-top: 10px; } </style> </head> <body> <div> <ul> <li>click me!</li> <li>click me!</li> <li>click me!</li> <li>click me!</li> </ul> <ul> <li>click me!</li> <li>click me!</li> <li>click me!</li> <li>click me!</li> </ul> <ul> <li>click me!</li> <li>click me!</li> <li>click me!</li> <li>click me!</li> </ul> <ul> <li>click me!</li> <li>click me!</li> <li>click me!</li> <li>click me!</li> </ul> <ul> <li>click me!</li> <li>click me!</li> <li>click me!</li> <li>click me!</li> </ul> </div> <input type="button" value="Start" /> </body> </html>