element el-upload自定義上傳顯示進度條，多文件上傳進度

<template>
    <div>
        <el-upload
                class="upload-demo"
                ref="upload"
                :multiple="false"
                action="void"
                :http-request="customUpload"
                :on-remove="handleRemove"
                :on-progress="progressA"
                :file-list="fileList"
                multiple
                :auto-upload="true">
            <el-button slot="trigger" size="small" type="primary">選取文件</el-button>
        </el-upload>
    </div>
</template>
<script>
    export default {
        data() {
            return {
                fileList: [],
            }
        },
        components: {},
        mounted() {
        },
        methods: {
            customUpload(file) {
                let FormDatas = new FormData();
                FormDatas.append('file', file.file);
                this.$axios({
                    url: 'http://192.168.1.5:8889/upload',
                    method: 'post',
                    data: FormDatas,
                    //上傳進度
                    onUploadProgress: (progressEvent) => {
                        let num = progressEvent.loaded / progressEvent.total * 100 | 0;  //百分比
                        file.onProgress({percent: num})     //進度條
                    }
                }).then(data => {
                    file.onSuccess(); //上傳成功(打鈎的小圖標)
                })
            },
            /**     文件正在上傳時的鈎子    **/
            progressA(event, file) {},
            /**     移除上傳文件    **/
            handleRemove(file) {
                this.$refs.upload.abort(); //取消上傳
                this.$message({message: '成功移除' + file.name, type: 'success'});
            },
        },
    }
</script>
<style>
</style>