index.wxml

<view class="flex ac jc p20">
   <textarea placeholder="說說您對商品的體驗吧！您最多可輸入200個字哦~" bindinput="bindTextAreaBlur" value="{{content}}" />
</view>
<view class="flex ac jc foot" bindtap="submitClick">提交評價</view>

index.js

  bindTextAreaBlur: function (e) {
    this.setData({
      content: e.detail.value
    })
    submitClick: function (e) {
    content: this.data.econtent
    }
 

傳參ok