微信小程序实现星星评分效果

*.wxml文件
<view class="container">
 <view class='stars'>
 <image src=''></image>
 <view class='content'>
 <view>评分</view>
 <view>
 <view wx:for="{{stars}}" wx:key="" style='background:url("{{item.flag==1?item.bgImg:item.bgfImg}}") no-repeat top; background-size:100%;' data-index="{{index}}" bindtap='score'></view>
 </view>
 </view>
 </view>
 <view class='reviews'>
 <textarea placeholder='请写下购买体会或商品的相关信息，可以拉其他小伙伴提供参考~（评价在100字以内）'></textarea>
 </view>
</view>

*.wxss文件
.stars{
 padding:85rpx 0 60rpx 273rpx;
 box-sizing: border-box;
 position: relative;
 border-bottom: 1rpx solid #ececec;
 background-color: #fff;
}
.stars image{
 width: 190rpx;
 height: 190rpx;
 border: 1rpx solid #000;
 position: absolute;
 top: 41rpx;
 left: 36rpx;
}
.stars .content view{
 font-size: 32rpx;
 color: #4a4a4a;
}
.stars .content>view:last-of-type{
 height: 40rpx;
 margin-top: 48rpx;
}
.stars .content>view:last-of-type view{
 float: left;
 width: 42rpx;
 height: 42rpx;
 margin-right: 25rpx;
 background-size: 100% 100%;
}

*.js文件
 data: {
 stars:[
 {
 flag:1,
 bgImg: "/star.png",
 bgfImg:"/f_star.png"
 },
 {
 flag: 1,
 bgImg: "/star.png",
 bgfImg: "/f_star.png"
 },
 {
 flag: 1,
 bgImg: "/star.png",
 bgfImg: "/f_star.png"
 },
 {
 flag: 1,
 bgImg: "/star.png",
 bgfImg: "/f_star.png"
 },
 {
 flag: 1,
 bgImg: "/star.png",
 bgfImg: "/f_star.png"
 }
 ]
 },
 score:function(e){
 var that=this;
 for(var i=0;i<that.data.stars.length;i++){
 var allItem = 'stars['+i+'].flag';
 that.setData({
 [allItem]: 1
 })
 }
 var index=e.currentTarget.dataset.index;
 for(var i=0;i<=index;i++){
 var item = 'stars['+i+'].flag';
 that.setData({
 [item]:2
 })
 }
 },