<el-upload
        v-else
        class='ensure ensureButt'
        :action="importFileUrl"
        :data="upLoadData"
        name="importfile"
        :onError="uploadError"
        :onSuccess="uploadSuccess"
        :beforeUpload="beforeAvatarUpload"
        >
        <el-button size="small" type="primary">确定</el-button>

data () {
  importFileUrl: 'http:dtc.com/cpy/add',
  upLoadData: {
    cpyId: '123456', 
    occurTime: '2017-08'
  }
},
methods: {
  // 上传成功后的回调
  uploadSuccess (response, file, fileList) {
   console.log('上传文件', response)
  },
  // 上传错误
  uploadError (response, file, fileList) {
   console.log('上传失败，请重试！')
  },
  // 上传前对文件的大小的判断
  beforeAvatarUpload (file) {
   const extension = file.name.split('.')[1] === 'xls'
   const extension2 = file.name.split('.')[1] === 'xlsx'
   const extension3 = file.name.split('.')[1] === 'doc'
   const extension4 = file.name.split('.')[1] === 'docx'
   const isLt2M = file.size / 1024 / 1024 < 10
   if (!extension && !extension2 && !extension3 && !extension4) {
    console.log('上传模板只能是 xls、xlsx、doc、docx 格式!')
   }
   if (!isLt2M) {
    console.log('上传模板大小不能超过 10MB!')
   }
   return extension || extension2 || extension3 || extension4 && isLt2M
  }
}

//html 代码
<el-upload :action="UploadUrl()" :on-success="UploadSuccess" :file-list="fileList">
  <el-button size="small" type="primary" >点击上传</el-button>
  <div slot="tip" class="el-upload__tip"></div>
</el-upload>

// js 代码在 methods中写入需要调用的方法
methods:{
  UploadUrl:function(){
    return "返回需要上传的地址";   
  }  
}