<view >

    <block wx:for="{{stars}}">

      <image class="star-image" style="left: {{item*100}}rpx" src="{{key > item ?(key-item == 0.5?halfSrc:selectedSrc) : normalSrc}}">

        <view class="item" style="left:0rpx" data-key="{{item+0.5}}" bindtap="selectLeft"></view>

        <view class="item" style="left:50rpx" data-key="{{item+1}}" bindtap="selectRight"></view>

      </image>

    </block>

  <view style="margin-top:450rpx">

    <button bindtap="startRating">确认</button>

  </view></view>

.star-image{

  position: absolute;

  top: 50rpx;

  margin-left: 100rpx;

  width: 100rpx;

  height: 100rpx;

  src: "/images/icon/star-no.png";

}.item{

  position: absolute;

  top: 50rpx;

  width: 100rpx;

  height: 100rpx;

}

//index.js

var app = getApp()

var count = 0;

Page({

  data: {

    stars: [0, 1, 2, 3, 4],

    normalSrc: '/images/icon/star-no.png',

    selectedSrc: '/images/icon/star-full.png',

    halfSrc: '/images/icon/star-half.png',

    key: 0,//评分

    status:'',    //0未课评 1已课评  },  /**

     * 生命周期函数--监听页面加载     */

  onLoad: function (options) {

    console.log(options.status)  },  /**

   * 点击左边,半颗星   */

  selectLeft: function (e) {

    var key = e.currentTarget.dataset.key

    if (this.data.key == 0.5 && e.currentTarget.dataset.key == 0.5) {

      //只有一颗星的时候,再次点击,变为0颗

      key = 0;    }

    count = key

    this.setData({

      key: key    })

  },  /**

   * 点击右边,整颗星   */

  selectRight: function (e) {

    var key = e.currentTarget.dataset.key

    count = key

    this.setData({

      key: key    })

  },

  // 确定按钮

  startRating: function (e) {

    wx.showModal({

      title: '分数',

      content: "" + count,

      success: function (res) {

        if (res.confirm) {

          console.log('用户点击确定')        }

      }

    })

  }

})