小程序OSS图片上传

图片上传加水印问题，代码如下！

chooseImage: function (e) {
    var that = this;
    wx.chooseImage({
      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
        console.log(res)
        let tempFilePaths = res.tempFilePaths;
        let imgFile = res.tempFiles;
        for (let i = 0; i < tempFilePaths.length;i++){
          let n = tempFilePaths[i].lastIndexOf('.');
          let type = tempFilePaths[i].substring(n);
          wx.request({
            url: 'https://www.********.com/api/plat/system/oss/signature?dir=wechatApp', //获取oss签名
            success: function (res) {
              console.log('签名', res.data.data)
              if (res.data.status == 'SUCCESS') {
                let post = res.data.data;
                let foot1 = 'x-oss-process=image/resize,w_1080,h_1920,m_fill/watermark,type_d3F5LXplbmhlaQ,size_38,text_'
                const aliyunFileKey = post.dir + that.guid() + type;
                let showUrl = null;
                wx.uploadFile({
                  url: post.host, //上传到OSS
                  filePath: tempFilePaths[i],
                  name: 'file',
                  formData: {
                    'key': aliyunFileKey,
                    'OSSAccessKeyId': post.accessKeyId,
                    'policy': post.policy,
                    'signature': post.signature,
                    'success_action_status': '200'
                  },
                  success: function (res) {
                    console.log("阿里云", res.statusCode)
                    if (res.statusCode == 200){
                      wx.showToast({
                        title: '上传成功',
                        icon:'success',
                        duration:1200
                      })
                      if (that.data.encodeWord) {
                        showUrl = post.host + '/' + aliyunFileKey + '?' + foot1 + that.data.encodeWord + that.data.urlFoot1;
                      } else {
                        showUrl = post.host + '/' + aliyunFileKey
                      }
                      let s = [showUrl]
                      that.setData({
                        files: that.data.files.concat(s)
                      });
                    }else{
                      wx.showToast({
                        title: '上传失败！',
                        icon: 'none',
                        duration: 1200
                      })
                    }
                  }
                })
              }
            }
          })
        }
      }
    })

wx.uploader中的name字段必须为file. 我这里是需要回显预览图片的时候需要图片有水印效果，才会去更改data中的files，这样也能做到批量上传的效果。