<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> </head> <body> <input type="checkbox" id="ck" onClick="xiugai()"/>同意 <input type="button" value="注册" id="btn" disabled="disabled" /> </body> <script type="text/javascript"> function xiugai() { //找到复选框 var ck=document.getElementById("ck"); //找到按钮 var btn=document.getElementById("btn"); //判断复选框的选中状态 if(ck.checked) { //移除按钮的不可用属性 btn.removeAttribute("disabled"); } else { //设置不可用属性 btn.setAttribute("disabled","disabled"); } } </script> </html>