Vue can not hear the change in the object's internal attributes, internal objects familiar to listeners of changes, you must write:
<html>
<head>
<script src="https://vuejs.org/js/vue.js"></script>
</head>
<body>
<div id="app">
<ul>
<li v-for="item in items" :key="item.id">
{{ item.name }}
</li>
</ul>
</div>
<script>
var app = new Vue({
el: '#app',
data() {
return {
items:[
{
"id": 1,
"name": "twy"
},
{
"id": 2,
"name": "dw"
},
{
"id": 3,
"name": "lisa"
}
]
}
},
methods: {
},
watch: {
items:{
handler:function(k,v){
console.log("change! ")
},
// immediate用于监测及时的改变
// immediate: true,
// 关键就是这句！,
deep:true,
}
},
computed: {
},
})
</script>
</body>
</html>