<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <input type="button" value="删除" id="btn"> <ul id="uu"> <li score="10" class="cls">小米的成绩</li> <li score="20">小鱼的成绩</li> <li score="30">小雨的成绩</li> <li score="40">小景的成绩</li> <li score="50">小静的成绩</li> </ul> <script> function my$(id) { return document.getElementById(id); } var list = my$("uu").getElementsByTagName("li"); for (var i = 0;i < list.length; i++) { list[i].setAttribute("age",10+i); list[i].onclick = function () { alert(this.getAttribute("age")+"岁"); } } my$("btn").onclick = function () { for (var j=0; j<list.length; j++){ list[i].removeAttribute("score"); list[j].removeAttribute("class"); } } </script> </body> </html>