vue+axios上传文件

单独上传文件：

<input class="file" name="file" type="file" accept="image/png,image/gif,image/jpeg" @change="update"/>

methods: {
      update(e){
        let file = e.target.files[0];
        let param = new FormData(); //创建form对象
        param.append('file',file);//通过append向form对象添加数据
        console.log(param.get('file')); //FormData私有类对象，访问不到，可以通过get判断值是否传进去
        let config = {
          headers:{'Content-Type':'multipart/form-data'}
        }; //添加请求头
        this.$http.post('http://127.0.0.1:8081/upload',param,config)
          .then(response=>{
            console.log(response.data);
          })
      }
    }

Form表单上传文件：

<form>
    <input type="text" value="" v-model="name" placeholder="请输入用户名">
    <input type="text" value="" v-model="age" placeholder="请输入年龄">
    <input type="file" @change="getFile($event)">
    <button @click="submitForm($event)">提交</button>
</form>

    data: {
          name: '',
          age: '',
          file: ''
        },
        methods: {
          getFile(event) {
            this.file = event.target.files[0];
            console.log(this.file);
          },
          submitForm(event) {
            event.preventDefault();
            let formData = new FormData();
            formData.append('name', this.name);
            formData.append('age', this.age);
            formData.append('file', this.file);
 
            let config = {
              headers: {
                'Content-Type': 'multipart/form-data'
              }
            }
 
            this.$http.post('http://127.0.0.1:8081/upload', formData, config).then(function (response) {
              if (response.status === 200) {
                console.log(response.data);
              }
            })
          }
        }