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。