What is the difference between wx:for and wx:for-item

This time I will bring you the difference between wx:for and wx:for-item, what are the precautions when using wx:for and wx:for-item, the following is a practical case, one Get up and take a look.

wx:for="{{list}}" is used to loop the array, and list is the array namewx:for-item=" items" is used to define the variable of each element during a loop. If it is a

one-dimensional array

, loop it out as follows:

<view wx:for="{{list}}">
{{index}} {{item.name}}
</view>

In the above code, item is the alias of list.

If it is a two-dimensional or even

multi-dimensional array

, loop as follows:

<view wx:for="{{parentList}}">
{{item.id}}
<view wx:for="{{item.childList}}" wx:for-item="items">
{{items.name}}{{item.account}}
</view>
</view>
for (var i = 0 ; i < list.length; i++) {
var xxx = list[i];
}

is equivalent to

<view wx:for="{{list}}" wx:for-item="xxx"></view>

Remember: wx:for is a loop array , wx:for-item is to assign an alias to the list

The following are several incorrect uses, please use them with caution:

1. Use wx:for-item directly, so the loop will not come out List

<view wx:for-item="{{list}}">
{{index}} {{item.name}}
</view>

2. Use wx:for-item with caution in sub-loops

<view wx:for="{{parentList}}">
 {{item.id}}
 <view wx:for-item="{{item.childList}}" wx:for-item="items">
 {{items.name}}{{items.account}}
 </view>

Correct usage of wx:for and wx:for-item in WeChat applet

wx :for="{{list}}" is used to loop the array, and list is the array name wx:for-item="items" is used to define the variables of each element during the loop

If it is a one-dimensional array, it is looped out as follows:

<view wx:for="{{list}}">
{{index}} {{item.name}}
</view>

In the above code, item is the alias of list.

If it is a two-dimensional or even multi-dimensional array, loop as follows:

<view wx:for="{{parentList}}">
{{item.id}}
<view wx:for="{{item.childList}}" wx:for-item="items">
{{items.name}}{{item.account}}
</view>
</view>
for (var i = 0 ; i < list.length; i++) {
var xxx = list[i];
}

is equivalent to

<view wx:for="{{list}}" wx:for-item="xxx"></view>

Remember: wx:for is a loop array, wx:for-item That is to assign an alias to the list

The following are several incorrect uses, please use them with caution:

1. Use wx:for-item directly, so that the list cannot be looped

<view wx:for-item="{{list}}">
{{index}} {{item.name}}
</view>

2. Use wx:for-item with caution in sub-loops

<view wx:for="{{parentList}}">
 {{item.id}}
 <view wx:for-item="{{item.childList}}" wx:for-item="items">
 {{items.name}}{{items.account}}
 </view>

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:

Angular parent component calls the child component in detail

Instructions for newbies to vue

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