代码
<html> <head> <meta charset="utf-8"> <meta content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no" /> <title></title> <script> window.onload=function(){ var selAll=document.getElementById("selAll"); var hobbys=document.getElementsByName("hobby"); var fx=document.getElementById("fx"); var myClick=document.getElementById("xz"); function myClick(){ alert("hello"); } //全选事件 selAll.onclick=function(){ if(selAll.checked == true){ for ( var i=0; i<hobbys.length; i++) { hobbys[i].checked=true; } }else{ for ( var i=0; i<hobbys.length; i++) { hobbys[i].checked=false; } } } //反选事件 fx.onclick=function(){ for (var i=0; i<hobbys.length; i++) { var b=hobbys[i]; if (b.checked == true) { b.checked=false }else{ b.checked=true; } } } } </script> </head> <body> <span><input type="checkbox"/>全选</span> <button>反选</button></br> <input type="checkbox" />羽毛球 <input type="checkbox"/>绘画 <input type="checkbox"/>唱歌 <input type="checkbox"/>跳舞 </body> </html>