<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>复选框（checkbox）全选/全不选/返选</title> <style> body,dl,dt,dd,p{margin:0;padding:0;} body{font-family:Tahoma;font-size:12px;} label,input,a{vertical-align:middle;} label{padding:0 10px 0 5px;} a{color:#09f;text-decoration:none;} a:hover{color:red;} dl{width:120px;margin:10px auto;padding:10px 5px;border:1px solid #666;border-radius:5px;background:#fafafa;} dt{padding-bottom:10px;border-bottom:1px solid #666;} dt label{font-weight:700;} p{margin-top:10px;} </style> <script type="text/javascript"> window.onload = function () { var oA = document.getElementsByTagName("a")[0]; var oInput = document.getElementsByTagName("input"); var oLabel = document.getElementsByTagName("label")[0]; var isCheckAll = function () { for (var i = 1, n = 0; i < oInput.length; i++) { oInput[i].checked && n++ } oInput[0].checked = n == oInput.length - 1; oLabel.innerHTML = oInput[0].checked ? "全不选" : "全选" }; //全选/全不选 oInput[0].onclick = function () { for (var i = 1; i < oInput.length; i++) { oInput[i].checked = this.checked } isCheckAll() }; //反选 oA.onclick = function () { for (var i = 1; i < oInput.length; i++) { oInput[i].checked = !oInput[i].checked } isCheckAll() }; //根据复选个数更新全选框状态 for (var i = 1; i < oInput.length; i++) { oInput[i].onclick = function () { isCheckAll() } } } </script> </head> <body> <dl> <dt><input type="checkbox" id="checkAll" /><label>全选</label><a href="javascript:;">反选</a></dt> <dd> <p><input type="checkbox" name="item" /><label>选项（一）</label></p> <p><input type="checkbox" name="item" /><label>选项（二）</label></p> <p><input type="checkbox" name="item" /><label>选项（三）</label></p> <p><input type="checkbox" name="item" /><label>选项（四）</label></p> <p><input type="checkbox" name="item" /><label>选项（五）</label></p> <p><input type="checkbox" name="item" /><label>选项（六）</label></p> <p><input type="checkbox" name="item" /><label>选项（七）</label></p> <p><input type="checkbox" name="item" /><label>选项（八）</label></p> <p><input type="checkbox" name="item" /><label>选项（九）</label></p> <p><input type="checkbox" name="item" /><label>选项（十）</label></p> </dd> </dl> <center>1、切换全选/全不选文字；2、根据选中个数更新全选框状态；</center> </body> </html>