javascript - Question about v-for loop in vuejs

Question

How do vue.js traverse objects using a for in-like method? I want to get a certain field name and value in the object.

Answer 1

<p id="box">
    <ul>
        <li v-for="val in arr" track-by="$index">
            {{val}}
           
        </li>
    </ul>
</p>

var vm=new Vue({
    el:'#box',
    data:{
       arr:['apple','banana','orange']
    },
    methods:{
        
    }
});
对于arr里面的$index 和 $key  在1.0之内的版本可以使用，在2.0之后就摒弃了，引入框架版本的时候一定要注意，在2.0还可以用  v-for="（val，index） in arr"   {{index}}

Answer 2

Don’t quite understand what it means?

Do you want to use v-for to display it on the page?

Or is it?

Answer 3

Object.keys obtains the array composed of the keys of this object, v-for traverses the array, and obtains the fields in the form of obj[k]

Answer 4

<p id="box">
    <ul>
        <li v-for="(val,key) in arr" track-by="$index">
            {{key}}:{{val}}  //key是键，val是值           
        </li>
    </ul>
</p>

var vm=new Vue({
    el:'#box',
    data:{
       arr:['apple','banana','orange']
    }
});

Answer 5

v-for = ‘(item, index) in items’
items array
item array item
index array item corresponding subscript
Code must be wrapped in quotes

Answer 6

<p v-for="(val, key) in object"></p>