vue 选中和全选两个计算属性实现_vue用计算属性实现全选和全不选-优快云博客

本文链接：https://blog.youkuaiyun.com/cofecode/article/details/79165127

还是选中和全选功能，用两个计算属性来实现，别人的代码，思维确实不一样。学习了

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		table, td, th{
		    border:1px solid #ebebeb;
		    border-collapse:collapse;
		    text-align: center;
		}
		table {
			width:500px;
		}
	</style>
	<script src="https://cdn.jsdelivr.net/npm/vue"></script>
</head>
<body>
	<div class="app">
		<table>
			<thead>
				<tr>
					<th style="line-height: 38px">选中数
						{{checkedCount}}<input type="checkbox" v-model="allchecked" style="zoom:200%;vertical-align: middle">
					</th>
					<th>name</th>
					<th>age</th>
				</tr>
			</thead>
			<tbody>
				<tr v-for="item in list">
					<td><input type="checkbox" v-model="item.checked" style="zoom:200%"></td>
					<td>{{item.name}}</td>
					<td>{{item.age}}</td>
				</tr>
			</tbody>
		</table>
	</div>
	<script>
		var list=[
			{
				name:'小明',
				age: 23,
				checked: false
			},
			{
				name:'小红',
				age: 2,
				checked: true
			},
			{
				name:'小蓝',
				age: 23,
				checked: true
			},
			{
				name:'小bai',
				age: 40,
				checked: true
			},
			{
				name:'王小二',
				age: 18,
				checked: false
			}
		]
		new Vue({
			el: '.app',
			data: {
				list
			},
			computed: {
              allchecked: {
                // getter
                get: function () {
                  return this.list.length == this.checkedCount
                },
                // setter
                set: function (val) {
                	//val就是点击之后，全选按钮的v-model值（状态）,勾上后就是val的值就是true。未勾上就是false
                    console.log(val)
                    this.list.forEach(item => {
	                  item.checked = val
	                })
                }
              },
              checkedCount: {
                // getter
                get: function () {
                  var i = 0
                  this.list.forEach(item => {
                  	if (item.checked === true) i++                  	
                  }) 
                  return i
                }
              }
            }
		})
	</script>
</body>
</html>