微信小程序实现图片压缩

<view>
 <view>
  <image src="{{imagesrc}}" style="width: 100%;" bindtap="chooseMyImage">
  </image>
 </view>
 <view class="textView">
 <text>
  （推荐使用jpg格式的图片）
 </text>
 </view>
 <view class="ImgOperateView">
 <button type="primary" bindtap="chooseMyImage">选择图片</button>
 <button type="primary" bindtap="MyImageCompression" style="{{show_hidden}}">压缩图片</button>
 </view>
</view>

// miniprogram/pages/ImgCompression/ImgCompression.js
Page({

 /**
 * 页面的初始数据
 */
 data: {
 imagesrc:"../../images/NoImage.jpg",
 imgcount:0,
 show_hidden: "display:none;",
 },

 //选择图片
 chooseMyImage:function () {
 var that = this;
 wx.chooseImage({
  count:1,
  success: function(res) {
  that.setData({
   imagesrc:res.tempFilePaths[0],
   imgcount:1,
   show_hidden:"display:block"
  }),
   wx.showToast({
   title: "已选择图片",
   })
  },

  fail: function() {
  wx.showToast({
   title:"请选择图片",
   icon:"none",
  })
  }
 })
 },

 //压缩图片
 MyImageCompression:function () {
 var that = this;
 if(that.data.imgcount == 1){
  wx.showToast({
  title: "正在压缩图片",
  icon:"loading",
  })

  wx.compressImage({
  src:that.data.imagesrc,
  quality:0,
  success: function(res) {
   wx.showToast({
   title: "压缩成功",
   });

   wx.saveImageToPhotosAlbum({
   filePath:res.tempFilePath,
   success:function(res) {
    wx.showToast({
    title: "已保存至相册",
    });
   }
   })
  },

  fail: function() {
   wx.showToast({
   title:"压缩失败",
   icon:"none",
   })
  }
  })
 }
 }
})