In wechat applet, the externally introduced JS is used in xwml for judgment and calculation

Use scene

• The same page shows two arrays , stay js It is troublesome to calculate the array length in
• Can be found in wxml Operation in

stay wxml Use in （ Put it in wxml Introduce in the file ）

<view class="item-info">
  <view class="item-title"> Reviewed by the owner </view>
  <wxs src="../../utils/calculate.wxs" module="tools" />
  <view class="wait" wx:if="{
    {tools.calculate(new_list,new_list_gs)>0}}"> To audit : {
    {
    tools.calculate(new_list,new_list_gs)}}</view>
</view>

establish The suffix is wxs The file of

function calculate(str1, str2) {
    
  if (str1) {
    
    return str1.length + str2.length
  } else {
    
    return '0'
  }
}
module.exports = {
    
  calculate: calculate
}