vue前端oss直传，formdata方式

备注：

此上传方式为input[type=file]方式，非element-upload，如有element上传需求，请参照后篇antd的oss上传；

此上传方法稍显粗糙，临时用于企业微信上传图片方式的改造，大伙儿可以酌情优化；

Html部分：

<input @change="imgUpload" class="weui-uploader__input" name="file" type="file" accept="image/*" multiple/>

js部分：

获取policy:

 getPolicyInfo() {
        return new Promise((resolve,reject)=>{
          getPolicyInfo({
            notDialog: true
          }).then((res) => {
            if(res.code == 0) {
              this.policyInfo = res.data
              resolve()
            }
          })
        })
      },

图片上传：

     imgUpload(event){
        let that = this
        let filesList = event.target.files
        let oldLength = this.uploadedImgData.length
        let length = filesList.length + oldLength
        if(length > 9){
          MessageBox({
            message: "最多可上传9张，您还可以上传" + (9 - oldLength) + "张",
            confirmButtonText:'确定',
            confirmButtonClass: 'confirm-fontsize'
          })
          return false
        }
        Indicator.open({
          text: '上传中...',
          spinnerType: 'fading-circle'
        })
        for(let i = 0; i < filesList.length; i++) {
          let imgSize = Math.floor(filesList[i].size / 1024)
          if (imgSize > 3*1024*1024) {
            MessageBox({
              message: "请选择3M以内的图片！",
              confirmButtonText:'确定',
              confirmButtonClass: 'confirm-fontsize'
            })
            return false
          }
          this.nowImgNum++;

          // oss逻辑
          const imgFormat = filesList[i].name.split('.')[1];
          const imgName = filesList[i].name.split('.')[0];
          const imgMd5Name = this.$md5(imgName);
          that.getPolicyInfo().then(()=>{
            const {
              host, OSSAccessKeyId, policy, signature
            } = that.policyInfo
            let formData = new FormData();
            formData.append('OSSAccessKeyId', OSSAccessKeyId);
            formData.append('policy', policy);
            formData.append('signature', signature);
            formData.append('Filename', '${filename}');
            formData.append('key', `bbs/${imgMd5Name}.${imgFormat}`);
            formData.append('success_action_status', '200');
            formData.append('file', filesList[i]);
            axios({
              url: host,
              header:{
                'Content-Type': 'multipart/form-data'
              },
              method: 'post',
              data: formData
            })
              .then(res => {
                if(res.status===200){
                  let ossUrlList = [];
                  ossUrlList.push(`bbs/${imgMd5Name}.${imgFormat}`)
                  that.changeOssToId(ossUrlList)
                }
              })
          });
          // end
        }

        that.uploadImgNum = 9 - this.nowImgNum
        if(that.uploadImgNum <= 0){
          that.isUploadImg = false
        }
      },

备注：

1.依然注意key的传输方法和最后拼装渲染的数组；

2.最后的that.changeOssToId(ossUrlList)方法不用在意，后端当初企业微信三方应用开发遗留的老方式，有个localId换图片的概念，方法之前已完成oss上传所有逻辑；