Instructions for using vue+storejs to obtain data

This time I bring to you, what are the precautions, the following is a practical case, let's take a look.

The specific code is as follows:

export default {
  data(){
    return {
      shopList:{},
      isEmpty:false, //判断购物车中是否有存在内容
    }
  },
  created(){
    if(!store.get('?shopCar')){
      this.isEmpty = true;
    }else{
      //对数据处理 将商店中名中的地址分离出来
      this.shopList = store.get('shopCar');
      console.log(this.shopList)
    }
  }  
}

At this time, print it out:

this.shopList The result displayed is {ob: Observer}

Although it can be used directly in vue as follows:

<ul>
  <li v-for = "list in shopList" :key = "list.id">
    {{list}}
  </li>
</ul>

But if I want to process the data in this.shopList at this time, problems will arise. At this time, if you want to traverse and loop the data , unexpected effects will occur, because the result displayed when printing this.shopList.length is undefined.

Traverse objectsThere are several methods:

1, the most commonly used for loop , but the length is undefined at this time, this method is not available;

2, for in cannot be used for the same reason as above

3. jquery also has methods for traversing objects$.each(this.shopList,function(n,i){})

You will find the third way to traverse this data, then you can realize the data processing.

But what if your this.shopList object contains another layer of objects? If .each() contains another layer of .each() and contains another layer of .each(), wouldn’t this problem be solved? In addition to this method, there is a better way:

created(){
    if(!store.get('?shopCar')){
      this.isEmpty = true;
    }else{
      //对数据处理 将商店中名中的地址分离出来
      var shopList = store.get('shopCar')
      $.each(shopList,function(n,i){
        //处理数据。。。。。
      })
      this.shopList = shopList;
      console.log(this.shopList)
    }
  }

A simpler and more direct way is to assign the data to a variable first, process the data into the format you want, and then copy it to this .shopList is enough.

Why can’t we process the data if we directly assign the data to this.shopList?

The reason is that when you assign data to this.shopList, you realize two-way binding of vue data.

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Recommended reading:

Vue.js Flask to build a single-page App (with code)

No need to traverse How to write JS

when regular multi-dimensional array

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