页面有多个上传时，携带参数和file文件流传递

第一种方法：将file转码后 使用json传过去

DOM：
	<el-upload
		ref="upload"
		action="/"
		:before-upload="beforeUpload"
		:default-file-list="fileList"
		:limit="1"
		>
		<el-button slot="trigger" size="small" type="primary">上传文件</el-button>
	</el-upload>
	
	<div slot="tip" class="el-upload__tip">只能上传 *** 文件</div>
	
JS：
beforeUpload(file) {
	let fileName = file.name;
	this.fileList = [file];
	this.read(file)
	return false;
},

read(f) {
	let rd = new FileReader();
	rd.onload = (e) => {
			this.form.file = rd.reading({encode: "UTF-8"})
	};
	rd.readAsBinaryString(f);
},

最终效果：

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第二种方法：使用formData

DOM：
<el-upload
		ref="upload"
		action="/"
		:on-change="handleChange"
		:file-list="fileList"
		:limit="1"
		>
		<el-button slot="trigger" size="small" type="primary">上传文件</el-button>
	</el-upload>
	
	<div slot="tip" class="el-upload__tip">只能上传 *** 文件</div>
	
JS：
handleChange(file) {
	this.file = file.raw
},

submitForm(){
	let form = new FormData();
	form.append('file', this.file )
	form.append('name', this.form.name)
	form.append('age', this.form.age)
	this.axios({
		method: "post",
		url: url,
		data: form,
		}, {
		headers: {
			'Content-Type': 'multipart/form-data'
		}
	}).then(res=>{
		// ....
	})
},

最终效果：