如何用JQuery实现复选框全选，代码是什么-群英

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Js相关技术

checked属性

如何获取所有复选框：document.getElementsByName、

需求分析

在我们对表格处理的时,有些情况下,我们需要对表格进行批量处理

技术分析

第一种方法：选择器[属性名称='属性值']

$("input[type='checkbox']:gt(0)").prop("checked",this.checked);

第二种方法：使用层级选择器来实现 tbody > tr > td > input

$("tbody > tr > td > input").prop("checked",this.checked);

第三种方法：

// #tab > tbody > tr:nth-child(4) > td:nth-child(1) > input[type="checkbox"]

代码实现

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script type="text/javascript" src="../js/jquery-1.11.0.js" ></script>
		
		<script>
						
			/*
			 表格全选和全不选
			 进一步确定事件: 点击事件
			 
			 */
			$(function(){
				//绑定点击事件
				//this 代表的是当前函数的所有者
				$("#checkAll").click(function(){
					//获取当前选中状态
//					alert(this.checked);
					//获取所有分类项的checkbox
					// 选择器[属性名称='属性值']
//					$("input[type='checkbox']:gt(0)").prop("checked",this.checked);
					
					//使用层级选择器来实现 tbody > tr > td > input
				//	$("tbody > tr > td > input").prop("checked",this.checked); //这个可行

				//	#tab > tbody > tr:nth-child(4) > td:nth-child(1) > input[type="checkbox"]
					$("input").prop("checked",this.checked);
					
				});
			});
			
		</script>
	</head>
	<body>
		<table border="1px" width="600px" id="tab">
			<thead>
				<tr >
					<td>
						<input type="checkbox" id="checkAll" />
					</td>
					<td>分类ID</td>
					<td>分类名称</td>
					<td>分类商品</td>
					<td>分类描述</td>
					<td>操作</td>
				</tr>
			</thead>
			<tbody>
				<tr>
					<td>
						<input type="checkbox" />
					</td>
				<td>1</td>
				<td>手机数码</td>
				<td>华为,小米,尼康</td>
				<td>黑马数码产品质量最好</td>
				<td>
					<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >修改</a>|<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >删除</a>
				</td>
			</tr>
			<tr>
				<td>
					<input type="checkbox" />
				</td>
				<td>2</td>
				<td>成人用品</td>
				<td>充气的</td>
				<td>这里面的充气电动硅胶的</td>
				<td><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >修改</a>|<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >删除</a></td>
			</tr>
			<tr>
				<td>
					<input type="checkbox" />
				</td>
				<td>3</td>
				<td>电脑办公</td>
				<td>联想,小米</td>
				<td>笔记本特卖</td>
				<td><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >修改</a>|<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >删除</a></td>
			</tr>
			<tr>
				<td>
					<input type="checkbox" />
				</td>
				<td>4</td>
				<td>馋嘴零食</td>
				<td>辣条,麻花,黄瓜</td>
				<td>年货</td>
				<td><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >修改</a>|<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >删除</a></td>
			</tr>
			<tr>
				<td>
					<input type="checkbox" />
				</td>
				<td>5</td>
				<td>床上用品</td>
				<td>床单,被套,四件套</td>
				<td>都是套子</td>
				<td><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >修改</a>|<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >删除</a></td>
			</tr>
			</tbody>
		</table>
		
	</body>
</html>

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