js批量上传文件特效代码

PetitQ 其他代码 2020-10-29

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js批量上传文件特效代码-云模板
今天接受项目中要完成文件批量上传文件而且还要显示上传进度，一开始觉得这个应该不是很麻烦，当我在做的时候遇到了很多问题，很头疼啊。不过看了别人写的代码，自己也测试过，发现网上好多都存在一些问题，并不是自己想要的，可实现删除，图片预览，文件批量上传，显示文件大小等功能。

```
<script src="js/vue.min.js"></script>
```
```
<div id="app">
```
```
  <div class="hello">
```
```
    <div class="upload">
```
```
      <div class="upload_warp">
```

        <div class="upload_warp_left" @click="fileClick">

```
          <img src="img/upload.png">
```
```
        </div>
```

        <div class="upload_warp_right" @drop="drop($event)" @dragenter="dragenter($event)" @dragover="dragover($event)">

```
          或者将文件拖到此处
```
```
        </div>
```
```
      </div>
```
```
      <div class="upload_warp_text">
```

        选中{{imgList.length}}个文件，共{{bytesToSize(this.size)}}

        <span class="ml20 c-red">[单个附件的最大尺寸为10MB]</span>

```
      </div>
```

      <input @change="fileChange($event)" type="file" id="upload_file" multiple style="display: none">

      <div class="upload_warp_img" v-show="imgList.length!=0">

        <div class="upload_warp_img_div" v-for="(item,index) of imgList">

          <div class="upload_warp_img_div_top">

            <div class="upload_warp_img_div_text">

```
              {{item.file.name}}
```
```
            </div>
```

            <img src="img/del.png" class="upload_warp_img_div_del" @click="fileDel(index)">

```
          </div>
```
```
          <img :src="item.file.src">
```
```
        </div>
```
```
      </div>
```
```
    </div>
```
```
  </div>
```
```
</div>
```
```
<script>
```
```
  var app = new Vue({
```
```
    el: '#app',
```
```
    data () {
```
```
      return {
```
```
        imgList: [],
```
```
        size: 0
```
```
      }
```
```
    },
```
```
    methods: {
```
```
      fileClick(){
```

        document.getElementById('upload_file').click()

```
      },
```
```
      fileChange(el){
```

        if (!el.target.files[0].size) return;

```
        this.fileList(el.target.files);
```
```
        el.target.value = ''
```
```
      },
```
```
      fileList(files){
```

        for (let i = 0; i < files.length; i++) {

```
          this.fileAdd(files[i]);
```
```
        }
```
```
      },
```
```
      fileAdd(file){
```

        this.size = this.size + file.size;//总大小

```
        let reader = new FileReader();
```
```
        reader.vue = this;
```
```
        reader.readAsDataURL(file);
```
```
        reader.onload = function () {
```
```
          file.src = this.result;
```
```
          this.vue.imgList.push({
```
```
            file
```
```
          });
```
```
        }
```
```
      },
```
```
      fileDel(index){
```

        this.size = this.size - this.imgList[index].file.size;//总大小

```
        this.imgList.splice(index, 1);
```
```
      },
```
```
      bytesToSize(bytes){
```
```
        if (bytes === 0) return '0 B';
```
```
        let k = 1000, // or 1024
```

          sizes = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'],

          i = Math.floor(Math.log(bytes) / Math.log(k));

        return (bytes / Math.pow(k, i)).toPrecision(3) + ' ' + sizes[i];

```
      },
```
```
      dragenter(el){
```
```
        el.stopPropagation();
```
```
        el.preventDefault();
```
```
      },
```
```
      dragover(el){
```
```
        el.stopPropagation();
```
```
        el.preventDefault();
```
```
      },
```
```
      drop(el){
```
```
        el.stopPropagation();
```
```
        el.preventDefault();
```

        this.fileList(el.dataTransfer.files);

```
      }
```
```
    }
```
```
  })
```
```
</script>
```

<div style="text-align:center;margin:50px 0; font:normal 14px/24px 'MicroSoft YaHei';">

```
</div>
```

也想出现在这里？联系我们吧

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