<!--pages/progress/progress.wxml-->
<text>pages/progress/progress.wxml</text>
<progress percent="20"> </progress>
abcd
<progress percent="50" activeColor="#DC143C"></progress>
<view>-----案例------</view>
<view>点击按钮完成，将图片1的进度条更新为80%</view>
<view wx:for="{{imageList}}" >
  <view>{{item.title}}</view>
  <progress percent="{{item.percent}}"  ></progress>
</view>

<button bindtap="changePercent" >点击</button>

// pages/progress/progress.js
Page({

  /**
   * 页面的初始数据
   */
  data: {
    percent1: 20,
    percent2: 50,
    imageList: [
      { id: 1, title: "图片1", percent: 20 },
      { id: 1, title: "图片2", percent: 30 },
      { id: 1, title: "图片3", percent: 60 },
    ]
  },
})

changePercent:function(){
    // 方式1：错误
    /*
    this.setData({
      imageList[0].person: 80
    });
    */
    

    // 方式2：可以，由于需要全部修改，所以性能差。
    /*
    var dataList = this.data.imageList;
    dataList[0].percent = 80;
    this.setData({
      imageList: dataList
    });
    */

  // 方式3：推荐
    var num = 2;
    this.setData({
      ["imageList[0].percent"]:80
      ["imageList[" + num + "].percent"]: 90,
      ["imageList[1].title"]:"hello world"
    })

  changePercent: function (e) {
    var num = 2
    this.setData({
      ["imageList[0].percent"]: 80,
      ["imageList[" + num + "].percent"]: 90,
      ["imageList[1].title"]: "Hello world!"
    })
  },