WeChat Mini Programs Implement Star Rating

<view>
    Star rating</view>
 
<view>
 
    <block class="brightStars">
        <image data-index='0' data-no="{{item}}" wx:for="{{starsBox}}" bindtap="changePic" wx:key="index" src="{{flag[0]>=item? '../img/starFull.png' : '../img/star.png'}}"></image>
    </block>
    <view class="texts">{{startext[0]}}</view>
</view>

Page({
    data: {
        flag: [0, 0, 0],
        startext: ['', '', '', ],
        starsBox: [1, 2, 3, 4, 5]
    },
 
    changePic: function (e) {
        var index = e.currentTarget.dataset.index;
        console.log(index,'-');
        var num = e.currentTarget.dataset.no;
        console.log(num);
        var a = 'flag[' + index + ']';
        console.log(a);
        var b = 'startext[' + index + ']';
        console.log(b);
        var that = this;
        if (num == 1) {
            that.setData({
                [a]: 1,
                [b]: 'Very dissatisfied'
            });
        } else if (num == 2) {
            that.setData({
                [a]: 2,
                [b]: 'unsatisfied'
            });
        } else if (num == 3) {
            that.setData({
                [a]: 3,
                [b]: 'General'
            });
        } else if (num == 4) {
            that.setData({
                [a]: 4,
                [b]: 'Satisfied'
            });
        } else if (num == 5) {
            that.setData({
                [a]: 5,
                [b]: 'Very satisfied'
            });
        }
    },
 
})

.container{
    display: flex;
    flex-direction: row;
    padding: 0;
    flex-wrap: nowrap;
    
}
 
image{
    width: 50px;
    height: 50px;
}

<view>Star Rating</view>
 
<block wx:for="{{starYesNum}}" wx:key="index">
  <image bindtap="selectStar" id='{{index+1}}' data-in='selectStarYes' src='../../static/img/starY.png'></image>
</block>
<block wx:for="{{starNoNum}}" wx:key="index">
  <image bindtap='selectStar' id='{{index+1}}' data-in='selectStarNo' src='../../static/img/starN.png'></image>
</block>
<view>{{starYesNum}} star</view>

Page({
  data: {
    starYesNum:0, //Number of lit stars starNoNum:5, //Number of unlit stars},
 
  selectStar:function(e){
    console.log(e.target.id);
    console.log(e.currentTarget.dataset.in);
 
    //Judge whether the clicked star is a bright star or a dark star, and set it if(e.currentTarget.dataset.in == 'selectStarNo'){
      this.setData({
        starYesNum: Number(e.target.id) + Number(this.data.starYesNum), 
        starNoNum:5-Number(e.target.id) - Number(this.data.starYesNum)
      })
    }else{
      this.setData({
        starYesNum:Number(e.target.id ),
        starNoNum:Number(5-e.target.id)
      })
    }
  },
})