Page({
 data: {
  tempFilePaths: ''
 },
 onLoad: function () {
 },
 chooseimage: function () {
  var that = this;
  wx.chooseImage({
   count: 1, // 默认9 
   sizeType: ['original', 'compressed'], // 可以指定是原图还是压缩图，默认二者都有 
   sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有 
   success: function (res) {
    // 返回选定照片的本地文件路径列表，tempFilePath可以作为img标签的src属性显示图片 
    that.setData({
     tempFilePaths: res.tempFilePaths
    })
   }
  })

 },




})

Page({
 data: {
  tempFilePaths: ''
 },
 onLoad: function () {
 },
 chooseimage: function () {
  var that = this;
  wx.showActionSheet({
   itemList: ['从相册中选择', '拍照'],
   itemColor: "#CED63A",
   success: function (res) {
    if (!res.cancel) {
     if (res.tapIndex == 0) {
      that.chooseWxImage('album')
     } else if (res.tapIndex == 1) {
      that.chooseWxImage('camera')
     }
    }
   }
  })

 },

 chooseWxImage: function (type) {
  var that = this;
  wx.chooseImage({
   sizeType: ['original', 'compressed'],
   sourceType: [type],
   success: function (res) {
    console.log(res);
    that.setData({
     tempFilePaths: res.tempFilePaths[0],
    })
   }
  })
 }


}) 

<button style="margin:30rpx;" bindtap="chooseimage">获取图片</button>
<image src="/UploadFiles/2021-04-02/{{tempFilePaths }}">

官方文档：https://mp.weixin.qq.com/debug/wxadoc/dev/api/media-picture.html
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