vue中如何使用element-ui的Upload上传组件

<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>
 <p slot="tip" class="el-upload__tip"></p>
</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"; 
 } 
}