vue axios form-data格式传输数据和文件方式

------WebKitFormBoundaryRO0YA4pq9oCgwTkt
Content-Disposition: form-data; name="id"
undefined
------WebKitFormBoundaryRO0YA4pq9oCgwTkt
Content-Disposition: form-data; name="type"
1
------WebKitFormBoundaryRO0YA4pq9oCgwTkt
Content-Disposition: form-data; name="name"
......此处省略一堆参数
------WebKitFormBoundaryRO0YA4pq9oCgwTkt--

multipart/form-data; boundary={boundary}

axios({
    url: "/aaa/bbb",
    method: 'post',
    data: xxx,
    headers: {"Content-Type": "multipart/form-data; boundary=----WebKitFormBoundaryn8D9asOnAnEU4Js0" }
})
// 或者在路由拦截中统一修改
service.interceptors.request.use(
req => {
    req.headers = {
        // 'Content-Type': 'application/json',
        'Content-Type': 'multipart/form-data; boundary=----WebKitFormBoundaryn8D9asOnAnEU4Js0',
    }
    return req;
}

{
    name: '小红',
    age: 18,
    file: File {name: "xxx.jpg",...} // 一个图片文件
}

let formData = new FormData();
formData.append('name','小红');
formData.append('age',18);
formData.append('file',File文件);

// html
<input type="file" ref="input" />
// js
let formData = new FormData();
formData.append('name','小红');
formData.append('age',18);
formData.append('file',this.$refs.input.files[0]);
let url = '你的请求地址'
axios.post(url,formData,{
    headers:{
        "Content-Type": "multipart/form-data; boundary=----WebKitFormBoundaryn8D9asOnAnEU4Js0"
    }
})

<template>
     <div id="sample">
        <!--accept定义接收的文件类型,这里只接受图片-->
        <input id="fileinput" @change="uploading($event)" type="file" accept="image/*">
           <button  @click="submit($event)"></button>
     </div>
</template>
<script>
export default {
  name: 'sample',
  data () {
    return {
        file:'',
        src:''
    };
  },
  methods:{
   uploading(event){
   this.file = event.target.files[0];//获取文件
       var windowURL = window.URL || window.webkitURL;
        this.file = event.target.files[0];
        //创建图片文件的url
        this.src = windowURL.createObjectURL(event.target.files[0]);
   },
   submit(){
   event.preventDefault();//取消默认行为
   let formdata = new FormData();
   formdata.append('file',this.file);
//此处必须设置为  multipart/form-data
let config = {
            headers: {
                'Content-Type': 'multipart/form-data'  //之前说的以表单传数据的格式来传递fromdata
            }
        };
        this.$http.post('/upload', formData, config).then( (res) => {
       //做处理
    }).catch((error) =>{
    });
   }
  }
};
</script>
<style lang="css" scoped>
</style>