<view>
 <view>一:显示后台给的评分</view>
 <block wx:for="{{one_1}}" wx:key="item">
  <image src='../img/plhou.png'></image>
 </block>
 <block wx:for="{{two_1}}" wx:key="item">
  <image src='../img/plqian.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='star' src='../img/plhou.png'></image>
</block>
<block wx:for="{{two_2}}" wx:key="index">
 <image catchtap='in_xin' id='{{index+1}}' data-in='starg' src='../img/plqian.png'></image>
</block>
<view>{{one_2}}星</view>

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

Page({

  /**
    * 页面的初始数据
    * 满分为5星
    */
  data: {
    num: 4,//后端给的分数，显示的星星
    one_1: '',//点亮的星星数
    two_1: '',//没有点亮的星星数
    one_2: 0,//点亮的星星数
    two_2: 5//没有点亮的星星数
  },

  /**
   * 生命周期函数--监听页面加载
   */
  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
    })
  },
  in_xin: function (e) {
    var in_xin = e.currentTarget.dataset.in;
    console.log(e.currentTarget.dataset.in);
    console.log(e.currentTarget);
    var one_2;
    if (in_xin == 'star') {
      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
    })
  },
})