Detailed explanation of for statement in small program development

This article mainly introduces relevant information on the detailed explanation of the for loop of the WeChat applet. Friends in need can refer to

1, wx:for

Use the wx:for control attribute on the component to bind an array, and the component can be repeatedly rendered using the data of each item in the array. The subscript of the current item of the default array Variable namedefaults to index, and the variable name of the current item of the array defaults to item. Examples are as follows:

wxml file:

<view wx:for="{{items}}">
{{index}}: {{item:one}}
</view>
js文件：
Page({
items:[{
one: "test1",
},{
one: "test2"
}]
})

You can use wx:for-item to specify the variable name of the current element of the array

You can use wx:for-index to specify the variable name of the current subscript of the array. Examples are as follows:

wxml file:

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

下面是一个九九乘法表事例：
<view wx:for="{{[1,2,3,4,5,6,7,8,9]}}" wx:for-item="i">
<view
 wx:for="{{[1,2,3,4,5,6,7,8,9]}}" wx:for-item="j">
<view
 wx:if="{{i <= j}}">
{{i}}*{{j}} = {{i * j}}
</view>
</view>
</view>

2, block wx:for

wx:for is used in< ;blcok/> tag to render a structure block containing multiple nodes. For example:

<block wx:for="{{[1,2,3]}}">
<view> {{index}}: </view>
<view> {{item}} </view>
</block>

The rendering is as follows:

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