check事件 

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<input type="checkbox" class="chk" value="" />
		<input type="checkbox" class="chk" value="" />
		<input type="checkbox" class="chk" value="" />
		<input type="checkbox" class="chk" value="" />
		<input type="checkbox" class="chk" value="" />
		<input type="checkbox" class="chk" value="" />
		<input type="button" id="" value="全选"onclick="bb()" />
		<input type="button" id="" value="全不选"onclick="cc()" />
		<input type="button" id="" value="反选"  onclick="aa()"/>
	</body>
</html>
<script type="text/javascript">
	function aa(){
		var chk = document.getElementsByClassName("chk");
		for(var i = 0;i<chk.length;i++){
			if(chk[i].checked){
				chk[i].checked=false;
			}else{
				chk[i].checked=true;
			}
		}
	}
	function bb(){
		var chk = document.getElementsByClassName("chk");
		for(var i = 0;i<chk.length;i++){
			chk[i].checked=true;
		}
	}
	function cc(){
		var chk = document.getElementsByClassName("chk");
		for(var i = 0;i<chk.length;i++){
			chk[i].checked=false;
		}
	}
</script>

 效果如下

全选

全不选

反选

posted @ 2018-09-09 08:54  元气满满01  阅读(459)  评论(0)  编辑  收藏  举报