复制代码
<!--这个组件主要用来研究upload这个elementui的上传插件组件-->

<template>
    <el-row>
        <el-col :span="8" :offset="8">
            <div id="upload">
                <label class="el-form-item__label" style="width: 80px;">上传图片</label>
                <!--elementui的上传图片的upload组件-->
                <el-upload
                  class="upload-demo"
                  :before-upload="beforeupload"
                  drag
                  action="https://jsonplaceholder.typicode.com/posts/"
                  style="margin-left:80px;">
                  <i class="el-icon-upload"></i>
                  <div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div>
                  <!--<div class="el-upload__tip" slot="tip">只能上传jpg/png文件，且不超过500kb</div>-->
                </el-upload>
                
                <!--elementui的form组件-->
                <el-form ref="form" :model="form" label-width="80px">
                    <el-form-item label="活动名称">
                        <el-input v-model="form.name" name="names" style="width:360px;"></el-input>
                    </el-form-item>
                    <el-form-item>
                        <el-button type="primary" @click="onSubmit">立即创建</el-button>
                        <el-button>取消</el-button>
                    </el-form-item>
                </el-form>
            </div>
        </el-col>
        
        <!--展示选中图片的区域-->
        <el-col :span="4" >
            <div style="width:100%;overflow: hidden;margin-left:150px;">
                <img :src="src" alt="" style="width:100%;"/>
            </div>
        </el-col>
    </el-row>
    
</template>

<script>
    export default {
        data() {
            return {
                form: {//form里面的参数
                  name: ''
               },
               param:"",//表单要提交的参数
               src:"https://afp.alicdn.com/afp-creative/creative/u124884735/14945f2171400c10764ab8f3468470e4.jpg" //展示图片的地址
            };
        },
        methods: {
            beforeRemove(file, fileList) {
                //return this.$confirm(`确定移除 ${ file.name }？`);
            },
            //阻止upload的自己上传，进行再操作
            beforeupload(file) {
                console.log(file);
                //创建临时的路径来展示图片
                var windowURL = window.URL || window.webkitURL;
                
                this.src=windowURL.createObjectURL(file);
                //重新写一个表单上传的方法
                this.param = new FormData();
                this.param.append('file', file, file.name);
                return false;
            },
            //覆盖默认的上传行为
            httprequest() {

            },
            onSubmit(){//表单提交的事件
                var names = this.form.name;
                //下面append的东西就会到form表单数据的fields中；
                this.param.append('message', names);
                let config = {
                    headers: {
                        'Content-Type': 'multipart/form-data'
                    }
                };
                //然后通过下面的方式把内容通过axios来传到后台
                //下面的this.$reqs 是在主js中通过Vue.prototype.$reqs = axios 来把axios赋给它;
                this.$reqs.post("/upload", this.param, config).then(function(result) {
                                console.log(result);
                })
            }
        }
    }
</script>

以上原理为，将表单数据与图片的信息组装到param,再提交

后台处理

if( ! empty($_FILES['file']['name']))
{
    $upload = new Upload();
    $thumb = $upload->file_upload($_FILES['file'], 'img');//此处调用上传，即可上传了
}