vue-upload 封装组件-上传组件

我后端的，刚接触vue个星期，根据需求写了个上传控件，很灵活的。没有看element el-upload源码，样式用的element的。感觉vue确实好用。

先看样子：

<!-- 单文件上传组件 -->
<template>
<div>
  <input type="file" id="file" hidden @change="fileChange" :accept="accept">
  <div v-if="upMode=='url'" style="width: 100%;display:inline-flex;">    
    <el-input :value="path" disabled></el-input>
    <el-button size="small" type="primary" @click="btnChange">{{autoUpload?label:'选择文件'}}</el-button>
    <el-button v-if="!autoUpload && loadButton" size="small" type="success" @click="uploadClick">{{label}}</el-button>    
  </div>
  <div v-else-if="upMode=='head'" class="upmode-head">
    <div class="el-upload el-upload--picture-card" @click="btnChange">
      <i v-if="path==''" class="el-icon-plus"></i>
      <img v-else :src="path">
    </div>
    <el-button v-if="!autoUpload && loadButton" size="small" type="success" @click="uploadClick">{{label}}</el-button>
  </div>
  <div v-else-if="upMode=='variable'" class="el-upload-dragger" @click="btnChange">
    <div v-if="path==''">
      <i class="el-icon-upload"></i><div class="el-upload__text"><em>{{label}}</em></div>
    </div>
    <img v-else :src="path">
  </div>   

</div>    
</template>

<script>
  import glob from '@/utils/global.js'
  export default {
    model: {   
      prop: 'path',
      event: 'onsuccess'
    },
    props: {
      label: {type: String, default: '上传'},//按钮文字
      accept: {String,default:'image/jpeg,image/png,image/x-icon'},//预选文件类型
      autoUpload:{type:Boolean, default:true},//是否自动上传
      loadButton:{type:Boolean, default:true},//手动上传时是否生成上传按钮
      path:String,//回显地址
      action: {type: String, default: '/api/upload/img'},//传入action可以调用不同接口适应不同文件类型上传
      upMode:{type: String, default: 'url'},//上传控件模式url,head,variable
    },
    methods: {
      btnChange() {
        var file = document.getElementById('file');
        file.click();
      },
      fileChange(e){
        try {          
          const fu = this.getFile();   
          if(fu==null)return;   
          if(!this.beforeUpload(fu))return;
          if(this.autoUpload){
            this.submit(fu);
          }else{
            if(this.upMode=='url')return; 
            //本地预览
            var reader = new FileReader();
            reader.readAsDataURL(fu);                    
            reader.onload = function(e) {
              var src = this.result;
              var str = '<img src="'+src+'">';
              var target=this.upMode=='head'?'.el-upload--picture-card':'.el-upload-dragger';
              var nim = document.querySelector(target);
              if(nim) {
                nim.innerHTML='';
                nim.insertAdjacentHTML("beforeEnd", str)
              }
            };
          }
            
        } catch (error) {
          console.debug('choice file err:',error);
        }
      },
      beforeUpload(f) {
        const maxSzie = glob.Config.UploadSize;
        if (f.size/1024/1024 > maxSzie) {
          this.$message.error('上传文件大小不能超过'+maxSzie+'M.');
          return false;
        }
        var types = glob.Config.UploadType;
        for (let i = 0; i < types.length; i++) {
          if(types[i]===f.type) return true;          
        }
        this.$message.error('上传文件格式不允许!');
        return false;
      },
      uploadClick(e){
        this.submit();
      },
      submit(file){
      try {
        if(!file) file = this.getFile();
        if(file==null)return;
        var isUpload =true;
        this.$emit('onbefore', file);
        if(!isUpload)return;
        const url =process.env.Store_API + this.action;
        var fd = new window.FormData();
        // 配置post请求的参数。参数名fileType，值为category（看后端的具体要求）
        fd.append('fileType', 'category');
        fd.append('file', file);
        var xhr = new XMLHttpRequest();
        xhr.open('POST', url, true);
        xhr.send(fd);
        xhr.onload = () => {
          if (xhr.status === 200) {
            var res = JSON.parse(xhr.responseText);
            if(res.code==1) {
              var imgurl = glob.StaticStoreHost+res.data;
              this.$emit('onsuccess', imgurl);
            }else{ 
              this.$message(res.message);
            }
          }
        }
      } catch (error) {
        console.debug('upload file err:',error);
      }   
      },
      getFile(){
        var file = document.getElementById('file');
        if(file.files.length==0){
          this.$message('没有选择文件');
          return null;
        }
        return file.files[0];
      },
    },    
    
  }
</script>

其实就这个小组件就体现到封装、继承、多态的思想，多花时间思考，代码就能简洁、灵活、可用性高。

样式也有重写，需要样式的评论支持下，谢谢。