upload2.vue

<template>
	<div class="singleImageUpload2 upload-container">
		<el-upload class="image-uploader" :data="dataObj" drag :multiple="false" :show-file-list="false" :action="action"
		  :on-success="handleImageScucess">
			<i class="el-icon-upload"></i>
			<div class="el-upload__text">Drag或<em>点击上传</em></div>
		</el-upload>
		<div v-show="imageUrl.length>0" class="image-preview">
			<div class="image-preview-wrapper" v-show="imageUrl.length>1">
				<img :src="imageUrl">
				<div class="image-preview-action">
					<i @click="rmImage" class="el-icon-delete"></i>
				</div>
			</div>
		</div>
	</div>
</template>

<script>
import { getToken } from '@/api/qiniu'

export default {
  name: 'singleImageUpload2',
  props: {
    value: String
  },
  computed: {
    imageUrl() {
      return this.value
    }
  },
  data() {
    return {
      action:'',
      tempUrl: '',
      dataObj: { token: '', key: '' }
    }
  },
  methods: {
    rmImage() {
      this.emitInput('')
    },
    emitInput(val) {
      this.$emit('input', val)
    },
    handleImageScucess() {
      this.emitInput(this.tempUrl)
    },
    beforeUpload() {
      const _self = this
      return new Promise((resolve, reject) => {
        getToken().then(response => {
          const key = response.data.qiniu_key
          const token = response.data.qiniu_token
          _self._data.dataObj.token = token
          _self._data.dataObj.key = key
          this.tempUrl = response.data.qiniu_url
          resolve(true)
        }).catch(() => {
          reject(false)
        })
      })
    }
  }
}
</script>

<style rel="stylesheet/scss" lang="scss" scoped>
.upload-container {
	width: 100%;
	height: 100%;
	position: relative;
	.image-uploader {
		height: 100%;
	}
	.image-preview {
		width: 100%;
		height: 100%;
		position: absolute;
		left: 0px;
		top: 0px;
		border: 1px dashed #d9d9d9;
		.image-preview-wrapper {
			position: relative;
			width: 100%;
			height: 100%;
			img {
				width: 100%;
				height: 100%;
			}
		}
		.image-preview-action {
			position: absolute;
			width: 100%;
			height: 100%;
			left: 0;
			top: 0;
			cursor: default;
			text-align: center;
			color: #fff;
			opacity: 0;
			font-size: 20px;
			background-color: rgba(0, 0, 0, .5);
			transition: opacity .3s;
			cursor: pointer;
			text-align: center;
			line-height: 200px;
			.el-icon-delete {
				font-size: 36px;
			}
		}
		&:hover {
			.image-preview-action {
				opacity: 1;
			}
		}
	}
}
</style>