微信小程序如何循环控制一行显示几个wx:for

正如上图所显示的一样，我们改如何控制一行显示几个图形呢？
首先第一种方法，数量少的可以自己一行一行的写，但是当数据很多的时候呢？
这时候就需要我们区使用循环进行代码的编写。废话不多数，直接写代码。

.demo-item{
width: 40%;
}
.demo-item .screen-data{
padding: 10rpx;
text-align: center;
}

json文件

{
“navigationStyle”: “custom”,
“navigationBarTextStyle”: “white”,
“usingComponents”: {
“tabchange”: “/components/tabchange/index”,
“search-bar”: “/base-ui/ms-search-bar/index”,
“ms-add-btn”: “/base-ui/ms-add-btn/index”,
“van-tab”: “@vant/weapp/tab/index”,
“van-tabs”: “@vant/weapp/tabs/index”,
“ms-main-navbar”: “/base-ui/ms-main-navbar/index”,
“van-sticky”: “@vant/weapp/sticky/index”,
“van-icon”: “@vant/weapp/icon/index”,
“form-item”: “/components/form-item/index”,
“van-popup”: “@vant/weapp/popup/index”,
“ms-button”: “/base-ui/ms-button/index”
}
}

js文件

 /**
     * 页面的初始数据
     */
    data: {
        Authorization: "",
        taskDetailParams: {
            "currentPage": 1,
            "filters": {
                "status": ""
            },
            "orderBys": [],
            "pageSize": 10
        },
        // navigationBarAndStatusBarHeight: 0,

        dataitem: {
            name: "数据",
            faren: "王五"
        },
        active: 0,
        totalCount: 0,
        tabs: ['全部', '入库', '出库'],
        tabIndex: 0,
        //状态栏高度
        statusBarHeight: Cache.getCacheSync(STATUSBARHEIGHT),
        //导航栏高度
        navigationBarHeight: Cache.getCacheSync(MENUBUTTONHEIGHT),
        //胶囊按钮的高度
        menuButtonHeight: Cache.getCacheSync(NAVIGATIONBARHEIGHT),
        //状态栏加导航栏高度
        navigationBarAndStatusBarHeight: Cache.getCacheSync(NAVIGATIONBARANDSTATUSBARHEIGHT),
        SAFEBOTTOM: Cache.getCacheSync(SAFEBOTTOM),

        filter:false,
        changecolor:[
          {name:'借入',changecolor:false},
          {name:'借出归还',changecolor:false},
          {name:'来料加工',changecolor:false},
          {name:'借出归还',changecolor:false},
          {name:'借出',changecolor:false},
          {name:'退料',changecolor:false},
        ]
    },
    

    onClose(){
      this.setData({
        filter:false
      })
    },
    changecolor(e){
      console.log(e,1)
      let sum=parseInt(e.currentTarget.dataset.item)
      console.log(typeof(sum))
      console.log(this.data.changecolor[sum].changecolor)
      this.data.changecolor.map((i,index)=>{
        console.log(i)
        this.setData({
          ['changecolor['+index+'].changecolor']:false
        })
      })
       this.setData({
        ['changecolor['+sum+'].changecolor']:true
       })
       console.log(this.data.changecolor)
    },
    queren(){
       this.setData({
         filter:false
       })
    },
    cancel(){
       this.setData({
         filter:false
       })
    },
    filter(){
       this.setData({
         filter:true
       })
    },

<van-popup show="{{ filter }}" position="right" custom-style="height: 100%; width:60%;padding-top:{{navigationBarAndStatusBarHeight+50}}px;" bind:close="onClose" catchtouchmove='ture'>
  <view>
    <view class="margin-left-10 margin-top-10 font-size-14" style="font-weight: 700;">业务类型</view>
    <!-- <view wx:for="{{changecolor}}">
      <view class="flex jc-around margin-top-10">
        <view class="padding-10 font-size-14" style="background-color:{{changecolor[index].changecolor?'#29AA4F':'#F2F2F2'}};color:{{changecolor[index].changecolor?'white':'black'}};" bindtap="changecolor" data-item="{{index}}">{{changecolor[index].name}}</view>
      </view>
      <view class="flex jc-around margin-top-10">
            <view class="padding-10 font-size-14" style="background-color: #F2F2F2;" bindtap="changecolor"
            style="background-color:{{changecolor[2].changecolor?'#29AA4F':'#F2F2F2'}};color:{{changecolor[2].changecolor?'white':'black'}};" 
            bindtap="changecolor" data-item="2">现款合同</view>
            <view class="padding-10 font-size-14" style="background-color: #F2F2F2;" bindtap="changecolor"
            style="background-color:{{changecolor[3].changecolor?'#29AA4F':'#F2F2F2'}};color:{{changecolor[3].changecolor?'white':'black'}};"
             bindtap="changecolor" data-item="3">来料合同</view>
          </view>
    
    </view> -->
     
    <block wx:for="{{changecolor.length/2}}" wx:for-index="i" wx:for-key="{{i}}" wx:key="i">
        <view class="flex jc-around margin-top-10">
          <!--每行循序2次，index参数赋值在j变量上-->
          <block wx:for="{{2}}" wx:for-index="j" wx:for-item="item_j" wx:for-key="key_j" wx:key="j">
            <!--此时数据的条数为i*2+j行数*2+第几行-->
            <block wx:if="{{changecolor[i*2+j].name}}">
              <view class="demo-item">
                <view class="screen-data font-size-14" data-item="{{i*2+j}}" style="background-color:{{changecolor[i*2+j].changecolor?'#29AA4F':'#F2F2F2'}};color:{{changecolor[i*2+j].changecolor?'white':'black'}};"
             bindtap="changecolor">{{changecolor[i*2+j].name}}</view>
              </view>
            </block>
          </block>
        </view>
      </block>

  </view>
  <view class="margin-top-10">
    <view class="margin-left-10 font-size-14" style="font-weight: 700;">供应原材料</view>
    <view class="flex jc-between grey padding-left-10 padding-top-5 padding-bottom-5 padding-right-5 margin-top-10" style="background-color: #F2F2F2;">
      <view>请选择</view>
      <van-icon name="arrow" />
    </view>
  </view>
  <view class="margin-top-10">
    <view class="margin-left-10 font-size-14" style="font-weight: 700;">储料仓</view>
    <view class="flex jc-between grey padding-left-10 padding-top-5 padding-bottom-5 padding-right-5 margin-top-10" style="background-color: #F2F2F2;">
      <view>请选择</view>
      <van-icon name="arrow" />
    </view>
  </view>


  <view class="flex jc-between" style="position: fixed; width: 100%; bottom: 0; padding-bottom:{{SAFEBOTTOM}}px;">
    <ms-button buttonType="ms-grey" class="margin-left-5" bindtap="cancel">取消</ms-button>
    <ms-button buttonType="ms-green" class="margin-right-5" bindtap="queren">确认</ms-button>
  </view>
</van-popup>

其中控制循环的代码就是下面这一部分

<block wx:for="{{changecolor.length/2}}" wx:for-index="i" wx:for-key="{{i}}" wx:key="i">
        <view class="flex jc-around margin-top-10">
          <!--每行循序2次，index参数赋值在j变量上-->
          <block wx:for="{{2}}" wx:for-index="j" wx:for-item="item_j" wx:for-key="key_j" wx:key="j">
            <!--此时数据的条数为i*2+j行数*2+第几行-->
            <block wx:if="{{changecolor[i*2+j].name}}">
              <view class="demo-item">
                <view class="screen-data font-size-14" data-item="{{i*2+j}}" style="background-color:{{changecolor[i*2+j].changecolor?'#29AA4F':'#F2F2F2'}};color:{{changecolor[i*2+j].changecolor?'white':'black'}};"
             bindtap="changecolor">{{changecolor[i*2+j].name}}</view>
              </view>
            </block>
          </block>
        </view>
      </block>