<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="app">
<p v-for="(item,index) in arr">{{index}} {{item}}</p><br>
<input type="button" value="点击改变" @click="changeClick">
</div>
<script src="https://cdn.bootcss.com/vue/2.6.11/vue.js"></script>
<script>
new Vue({
el:"#app",
data(){
return {
arr:["q","w","e"]
}
},
methods:{
changeClick(){
// 查看this,发现$set是原型上的方法可以直接调用
console.log(this);
// arr是Vue实例的属性
console.log(this.arr);
// item index 想要的value值
this.$set(this.arr,0,"qq")
}
}
})
</script>
</body>
</html>
Python3Turtle