<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>全选</title> </head> <body> <input id="a" type="checkbox" /><label for="a">反选</label> <input id="b" type="checkbox" /><label for="b">全选</label> <div id="area"> <input type="checkbox" /> <input type="checkbox" /> <input type="checkbox" checked=true /> <input type="checkbox" checked=true /> <input type="checkbox" checked=true /> <input type="checkbox" checked=true /> <input type="checkbox" /> <input type="checkbox" /> <input type="checkbox" /> <input type="checkbox" /> </div> </body> </html> <script type="text/javascript"> var oInput=document.getElementById("a"); var bInput=document.getElementById("b"); var aInput=document.getElementsByTagName("div")[0].getElementsByTagName("input"); bInput.onclick=function(){ if(this.checked){ for (var i = 0; i < aInput.length; i++){ aInput[i].checked=true; } }else{ for (var i = 0; i < aInput.length; i++){ aInput[i].checked=false; } } } oInput.onclick=function(){ for (var i = 0; i < aInput.length; i++){ if(aInput[i].checked){ aInput[i].checked=false; }else{ aInput[i].checked=true; } }; } </script>
原文：http://www.cnblogs.com/busicu/p/4228181.html