前台wxml代码

点击navigator，跳转到裁剪页面

 <navigator url="/pages/cropper/cropper?userid={{user._id}}&&imgSrc={{user.img}}" hover-class="none">
            <view class="user-logo-section">
                <text class="user-info-content user-name">{{user.name}}</text>
                <text class="user-info-content user-gender">{{user.sex === 'M' ? '男' : '女'}}</text>
            </view>
            <view class="user-logo-section">
                <text class="user-info-content user-phone">{{user.phone}}</text>
            </view>
        </navigator>

裁剪页面代码

<view style="width:100%;height:500rpx;">
    <image-cropper id="image-cropper" bindload="cropperload" bindimageload="loadimage" bindtapcut="clickcut" limit_move="{{limit_move}}" disable_rotate="{{disable_rotate}}" width="{{width}}" height="{{height}}" imgSrc="{{src}}" angle="{{angle}}" disable_width="{{disable_width}}" max_width="{{max_width}}" max_height="{{max_height}}" disable_height="{{disable_height}}" disable_ratio="{{disable_ratio}}">
    </image-cropper>
</view>
<view class='bottom' style="width: 100%;align-content: center;display: flex;flex-direction:row;">
    <button  type="primary"  catchtap='upload'>选择</button>
    <button bindtap='submit' style="margin-left:30px;"  type="primary">完成</button>
</view>

//获取应用实例
const App = getApp()
const db = wx.cloud.database()
Page({
  data: {
    src: '',
    width: 250, //宽度
    height: 250, //高度
    max_width: 300,
    max_height: 300,
    disable_rotate: false, //是否禁用旋转
    disable_ratio: true, //锁定比例
    limit_move: true, //是否限制移动
    userid: ''
  },
  onLoad: function (options) {
    this.cropper = this.selectComponent("#image-cropper");
    this.setData({
      src: options.imgSrc,
      userid: options.userid
    });
    console.log('进入更换头像界面' + options.userid)
    if (!options.imgSrc) {
      this.cropper.upload(); //上传图片
    }
  },
  cropperload(e) {
    console.log('cropper加载完成');
  },
  loadimage(e) {
    wx.hideLoading();
    console.log('图片');
    this.cropper.imgReset();
  },
  clickcut(e) {
    console.log(e.detail);
    //图片预览
    wx.previewImage({
      current: e.detail.url, // 当前显示图片的http链接
      urls: [e.detail.url] // 需要预览的图片http链接列表
    })
  },
  upload() {
    let that = this;
    wx.chooseImage({
      count: 1,
      sizeType: ['compressed'],
      sourceType: ['album', 'camera'],
      success(res) {
        wx.showLoading({
          title: '加载中',
        })
        const tempFilePaths = res.tempFilePaths[0];
        //重置图片角度、缩放、位置
        that.cropper.imgReset();
        that.setData({
          src: tempFilePaths
        });
      }
    })
  },
  submit() {
    wx.showLoading({
      title: '加载中',
    })
    let that = this;
    let fileId = ''
    this.cropper.getImg((obj) => {
      console.log('这个是我从界面中获取到的图片：' + JSON.stringify(obj))
      let suffix = /\.\w+$/.exec(obj.url) //文件扩展名
      console.log('获取到的文件的后缀是：' + suffix)
      wx.cloud.uploadFile({
        cloudPath: 'photo/' + Date.now() + '-' + Math.random() * 1000000 + suffix, //云端路径
        filePath: obj.url,
        success: (result) => {
          fileId = result.fileID
          console.log('这里有个userid：'+this.data.userid)
          wx.cloud.callFunction({
            name: 'phone',
            data: {
              fileId: fileId,
              _id:this.data.userid,
              $url: 'updateData'
            }
          }).then((res) => {
           console.log('结果：'+JSON.stringify(res))
           wx.showToast({
             title: '上传成功',
           })
            wx.hideLoading()
            wx.navigateBack()
          })
          console.log('上传后返回的fileId' + result.fileID)
        },
        fail: (res) => {
          console.log('上传失败：' + res)
        },
        complete: (res) => {},
      })
    });
  },
})

app.router('updateData', async (ctx, next) => {
    let _id=event._id
    ctx.body = await db.collection('phonelist').doc(_id)
      .update({
        data:{
          img: event.fileId,
        }
      }).then((res) => {
        return res
      })
  })