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Detailed explanation of the steps for vue to process data obtained by storejs

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Apr 11, 2018 pm 02:01 PM

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This time I will bring you a detailed explanation of the steps for vue to process data obtained from storejs. What are the precautions for vue to process data obtained from storejs. The following is a practical case. Let’s take a look. 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)
    }
  }  
}

Print it out at this time:

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

Although it can be used directly in vue as follows:

{{list}}

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

Traverse objectsThere are several methods:

1. The most commonly used for loop, but at this time length is undefined and 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 a third method that can traverse this data, and then the data can be processed.

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.

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:

What are the reasons why using v-show in vuejs does not work

vue calculated properties Detailed explanation

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