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>