商品星星评价

<view>
  <view>一:显示后台给的评分</view>
  <block wx:for="{{one_1}}">
    <image src='../img/评价灰.png'></image>
  </block>
  <block wx:for="{{two_1}}">
    <image src='../img/评价灰.png'></image>
  </block>
</view>
<view>这里num给的是几分就显示几颗星星</view>

<view style='margin-top:60px;'>二:显示用户选择的评分</view>
<block wx:for="{{one_2}}" wx:key="index">
  <image catchtap='in_xin' id='{{index+1}}' data-in='use_sc2' src='../img/评价.png'></image>
</block>
<block wx:for="{{two_2}}" wx:key="index">
  <image catchtap='in_xin' id='{{index+1}}' data-in='use_sc' src='../img/评价灰.png'></image>
</block>
<view>{{one_2}}星</view>

Page({
  /** 
   * 统一满分为5星 
   */
  data: {
    num: 4,//后端给的分数,显示相应的星星  
    one_1: '',
    two_1: '',
    one_2: 0,
    two_2: 5
  },
  onLoad: function (options) {
    //情况一:展示后台给的评分  
    this.setData({
      one_1: this.data.num,
      two_1: 5 - this.data.num
    })
  },

  //情况二:用户给评分  
  in_xin: function (e) {
    var in_xin = e.currentTarget.dataset.in;
    var one_2;
    if (in_xin === 'use_sc2') {
      one_2 = Number(e.currentTarget.id);
    } else {
      one_2 = Number(e.currentTarget.id) + this.data.one_2;
    }
    this.setData({
      one_2: one_2,
      two_2: 5 - one_2
    })
  }
})  

image{  
  height: 60rpx;  
   60rpx;  
  display: inline-block  
}