<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> <script> window.onload = function(){ var obtn1 = document.getElementById('btn1'); var obtn2 = document.getElementById('btn2'); var obtn3 = document.getElementById('btn3'); var odiv = document.getElementById('div1'); var ocheck = odiv.getElementsByTagName('input'); obtn1.onclick = function(){ //全选 for(var i=0;i<ocheck.length;i++){ ocheck[i].checked = true; } }; obtn2.onclick = function(){ //不选 for(var i=0;i<ocheck.length;i++){ ocheck[i].checked = false; } }; obtn3.onclick = function(){ //反选 for(var i=0;i<ocheck.length;i++){ ocheck[i].checked = !ocheck[i].checked; } }; } </script> //代码如下，
</head> <body> <input type="button" id="btn1" value="全选" /> <input type="button" id="btn2" value="不选" /> <input type="button" id="btn3" value="反选" /> <div id="div1"> <input type="checkbox" /><br /> <input type="checkbox" /><br /> <input type="checkbox" /><br /> <input type="checkbox" /><br /> <input type="checkbox" /><br /> <input type="checkbox" /><br /> <input type="checkbox" /><br /> <input type="checkbox" /><br /> <input type="checkbox" /><br /> <input type="checkbox" /><br /> <input type="checkbox" /><br /> </div> </body> </html>
