使用iView Upload 组件实现手动上传图片的示例代码

<template>
  <div class="demo-upload-list" v-for="item in uploadList">
    <template v-if="item.status === 'finished'">
      ![](item.url)
      <div class="demo-upload-list-cover">
        <Icon type="ios-eye-outline" @click.native="handleView(item.name)"></Icon>
        <Icon type="ios-trash-outline" @click.native="handleRemove(item)"></Icon>
      </div>
    </template>
    <template v-else>
      <Progress v-if="item.showProgress" :percent="item.percentage" hide-info></Progress>
    </template>
  </div>
  <Upload
    ref="upload"
    :show-upload-list="false"
    :default-file-list="defaultList"
    :on-success="handleSuccess"
    :format="['jpg','jpeg','png']"
    :max-size="2048"
    :on-format-error="handleFormatError"
    :on-exceeded-size="handleMaxSize"
    :before-upload="handleBeforeUpload"
    multiple
    type="drag"
    action="//jsonplaceholder.typicode.com/posts/"
    >
    <div >
      <Icon type="camera" size="20"></Icon>
    </div>
  </Upload>
  <Modal title="查看图片" v-model="visible">
    ![]('https://o5wwk8baw.qnssl.com/' + imgName + '/large')
  </Modal>
</template>
<script>
  export default {
    data () {
      return {
        defaultList: [
          {
            'name': 'a42bdcc1178e62b4694c830f028db5c0',
            'url': 'https://o5wwk8baw.qnssl.com/a42bdcc1178e62b4694c830f028db5c0/avatar'
          },
          {
            'name': 'bc7521e033abdd1e92222d733590f104',
            'url': 'https://o5wwk8baw.qnssl.com/bc7521e033abdd1e92222d733590f104/avatar'
          }
        ],
        imgName: '',
        visible: false,
        uploadList: []
      }
    },
    methods: {
      handleView (name) {
        this.imgName = name;
        this.visible = true;
      },
      handleRemove (file) {
        // 从 upload 实例删除数据
        const fileList = this.$refs.upload.fileList;
        this.$refs.upload.fileList.splice(fileList.indexOf(file), 1);
      },
      handleSuccess (res, file) {
        // 因为上传过程为实例，这里模拟添加 url
        file.url = 'https://o5wwk8baw.qnssl.com/7eb99afb9d5f317c912f08b5212fd69a/avatar';
        file.name = '7eb99afb9d5f317c912f08b5212fd69a';
      },
      handleFormatError (file) {
        this.$Notice.warning({
          title: '文件格式不正确',
          desc: '文件 ' + file.name + ' 格式不正确，请上传 jpg 或 png 格式的图片。'
        });
      },
      handleMaxSize (file) {
        this.$Notice.warning({
          title: '超出文件大小限制',
          desc: '文件 ' + file.name + ' 太大，不能超过 2M。'
        });
      },
      handleBeforeUpload () {
        const check = this.uploadList.length < 5;
        if (!check) {
          this.$Notice.warning({
            title: '最多只能上传 5 张图片。'
          });
        }
        return check;
      }
    },
    mounted () {
      this.uploadList = this.$refs.upload.fileList;
    }
  }
</script>
<style>
  .demo-upload-list{
    display: inline-block;
    width: 60px;
    height: 60px;
    text-align: center;
    line-height: 60px;
    border: 1px solid transparent;
    border-radius: 4px;
    overflow: hidden;
    background: #fff;
    position: relative;
    box-shadow: 0 1px 1px rgba(0,0,0,.2);
    margin-right: 4px;
  }
  .demo-upload-list img{
    width: 100%;
    height: 100%;
  }
  .demo-upload-list-cover{
    display: none;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0,0,0,.6);
  }
  .demo-upload-list:hover .demo-upload-list-cover{
    display: block;
  }
  .demo-upload-list-cover i{
    color: #fff;
    font-size: 20px;
    cursor: pointer;
    margin: 0 2px;
  }
</style>

<template>
  <div>
    <div class="demo-upload-list" v-for="item in uploadList">
      ![](item.url)
      <div class="demo-upload-list-cover">
        <Icon type="ios-trash-outline" @click.native="handleRemove(item)"></Icon>
      </div>
    </div>
    <Upload ref="upload" :show-upload-list="false" :format="['jpg','jpeg','png']" :max-size="2048" :before-upload="handleBeforeUpload" :on-format-error="handleFormatError" :on-exceeded-size="handleMaxSize" type="drag" action="//jsonplaceholder.typicode.com/posts/" >
      <div >
        <Icon type="camera" size="20"></Icon>
      </div>
    </Upload>
  </div>
</template>
<script>
export default {
 methods: {
  data(){
    return {
      uploadList: []
    }
  },
  handleBeforeUpload(file) {
    // 创建一个 FileReader 对象
    let reader = new FileReader()
    // readAsDataURL 方法用于读取指定 Blob 或 File 的内容
    // 当读操作完成，readyState 变为 DONE，loadend 被触发，此时 result 属性包含数据：URL（以 base64 编码的字符串表示文件的数据）
    // 读取文件作为 URL 可访问地址
    reader.readAsDataURL(file)

    const _this = this
    reader.onloadend = function (e) {
      file.url = reader.result
      _this.uploadList.push(file)
    }
  },
  handleRemove(file) {
    this.uploadList.splice(this.uploadList.indexOf(file), 1)
  },
  handleFormatError(file) {
   this.$Notice.warning({
    title: '文件格式不正确',
    desc: '文件 ' + file.name + ' 格式不正确，请上传 jpg 或 png 格式的图片。'
   })
  },
  handleMaxSize(file) {
   this.$Notice.warning({
    title: '超出文件大小限制',
    desc: '文件 ' + file.name + ' 太大，不能超过 2M。'
   })
  }
 }
}
</script>
<style scoped>
.demo-upload-list {
  display: inline-block;
  width: 60px;
  height: 60px;
  text-align: center;
  line-height: 60px;
  border: 1px solid transparent;
  border-radius: 4px;
  overflow: hidden;
  background: #fff;
  position: relative;
  box-shadow: 0 1px 1px rgba(0, 0, 0, .2);
  margin-right: 4px;
}

.demo-upload-list img {
  width: 100%;
  height: 100%;
}

.demo-upload-list-cover {
  display: none;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, .6);
}

.demo-upload-list:hover .demo-upload-list-cover {
  display: block;
}

.demo-upload-list-cover i {
  color: #fff;
  font-size: 20px;
  cursor: pointer;
  margin: 0 2px;
}

.ivu-icon {
  line-height: 58px;
}
</style>