关于ElementUI的el-upload组件二次封装的问题

**uploadImg.vue**
<template>
  <div>
    <el-upload :disabled="idCardIsUpload" class="avatar-uploader" action="" list-type="picture" :show-file-list="false" :http-request="diyRequest">
      <el-image v-if="idCardImgUrl" :src="idCardImgUrl" name="idCardImgUrl" class="avatar" @error="imgLoadError"></el-image>
      <el-progress style="margin: 5px;" :width='70' v-else-if="idCardIsUpload" type="circle" :percentage="idCardUploadPercentage"></el-progress>
      <div v-else class="div-plus">
        <i class="el-icon-plus avatar-uploader-icon"></i>
      </div>
    </el-upload>
  </div>
</template>

<script>
export default {
  data() {
    return {
      idCardImgUrl: '',
      idCardIsUpload: false,
      idCardUploadPercentage: 0,
      errorImgUrls: [],
    }
  },
  props: {
      /*可以在使用组件的时候传入一个支持上传的图片格式的数组进来，不传默认default数组*/
    supportType: {//支持上传文件的格式
      default: () => ['image/jpeg', 'image/jpg', 'image/png'],
      type: Array
    }
  },
  methods: {
      /*父组件执行的方法*/
    setEditImg(path) {
      this.idCardImgUrl = path ? path : ''
    },
    /*自定义上传的方法*/
    diyRequest(param) {
      /*对上传图片的大小和格式校验*/
      const isLt10M = param.file.size / 1024 / 1024 < 4
      if (this.supportType.indexOf(param.file.type) == -1) {
        let supportType = this.supportType
        let msg = ''
        supportType.map(res => {
          msg += res.substring(6) + '/'
        })
        let newMsg = msg.slice(0, (msg.length) - 1)
        this.$Message('error', `请上传正确的图片格式！支持的格式有：` + newMsg)
        return
      }
      if (!isLt10M) {
        this.$Message('error', '上传图片大小不能超过4MB哦!')
        return
      }
      const fileObj = param.file
      const form = new FormData()
      form.append('file', fileObj)
      let callback = (progress) => {
        this.idCardIsUpload = true
        this.idCardUploadPercentage = progress
      }
      /*走后台接口，这里自行换成自己的api*/
      this.$api.addUploadImg(form, callback).then(res => {
        this.idCardIsUpload = false
        this.idCardUploadPercentage = 0
        if (res.code == 200) {
          this.idCardImgUrl = res.data.basePath + res.data.url
          /*成功之后将图片路径暴露给父组件去显示图片*/
          this.$emit('setCardPic', res.data.url)
        } else {
          this.$Message('error', res.message)
        }
      })
    },
    /*当图片显示失败的时候，我会重复10次赋值图片，成功显示就退出，还是失败就会显示失败*/
    imgLoadError(error) {
      let isExist = false
      const src = error.path[0].src.split('?')[0]
      if (this.errorImgUrls.length == 0) {
        this.errorImgUrls.push({ 'src': src, 'number': 1 })
      }
      for (let i = 0; i < this.errorImgUrls.length; i++) {
        if (src === this.errorImgUrls[i].src) {
          isExist = true
          while (this.errorImgUrls[i].number < 10) {
            console.log('我在重复赋值...')
            this.errorImgUrls[i].number++
            const timestamp1 = Date.parse(new Date())
            this[error.path[0].name] = src + '?t=' + timestamp1
          }
        }
      }
      if (!isExist) {//首次上传（不在错误数组图片中，需要执行循环三次赋值）
        this.errorImgUrls.push({ 'src': src, 'number': 1 })
        this.imgLoadError(error)
      }
    },
  }
}
</script>

<style lang="scss" scoped>
.div-plus {
  width: 174px;
  height: 174px;
  display: flex;
  align-items: center;
  justify-content: center;
}
</style>
<style lang="scss">
.avatar-uploader .el-upload {
  border: 1px dashed #d9d9d9;
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.avatar-uploader .el-upload:hover {
  border-color: #409eff;
}
.avatar-uploader-icon {
  font-size: 28px;
  color: #8c939d;
  width: 120px;
  text-align: center;
}
.avatar {
  width: 120px;
  height: 120px;
  display: block;
}
</style>

/*导入组件*/
import uploadImg from '@/components/uploadImg'
/*组件注册*/
export default {
    components: { uploadImg },
    data(){
        imgpath: '',
    },
    methods:{
        /*执行uploadImg组件报出来的事件，path就是显示图片的路径*/
        setCardPic(path, pic) {
          this.form[pic] = path
        },
        /*详情的时候设定显示图片的路径 setEditImg是uploadImg组件提供的方法 imgpath是子组件的ref属性（看使用的组件）*/
        this.$refs.imgpath.setEditImg('')
    }
}

<template>
<el-form-item label="广告图片:" prop="imgpath">
     <uploadImg @setCardPic="setCardPic($event,'imgpath')" ref="imgpath"></uploadImg>
      <span style="font-size: 12px;color: #606266;">只能上传jpg/png/jpeg文件，且不超过4MB</span>
</el-form-item>
</template>

<template>
  <div class="component-upload-image">
    <el-upload
      :action="uploadImgUrl"
      list-type="picture-card"
      :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload"
      :on-error="handleUploadError"
      name="file"
      :show-file-list="false"
      :headers="headers"
      style="display: inline-block; vertical-align: top"
    >
      <el-image v-if="!value" :src="value">
        <div slot="error" class="image-slot">
          <i class="el-icon-plus" />
        </div>
      </el-image>
      <div v-else class="image">
        <el-image :src="value" :style="`width:150px;height:150px;`" fit="fill"/>
        <div class="mask">
          <div class="actions">
            <span title="预览" @click.stop="dialogVisible = true">
              <i class="el-icon-zoom-in" />
            </span>
            <span title="移除" @click.stop="removeImage">
              <i class="el-icon-delete" />
            </span>
          </div>
        </div>
      </div>
    </el-upload>
    <el-dialog :visible.sync="dialogVisible" title="预览" width="800" append-to-body>
      <img :src="value" style="display: block; max-width: 100%; margin: 0 auto;">
    </el-dialog>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";
export default {
  name:'ImageUpload',
  data() {
    return {
      dialogVisible: false,
      uploadImgUrl: process.env.VUE_APP_BASE_API + "/common/upload", // 上传的图片服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
    };
  },
  props: {
    value: {
      type: String,
      default: "",
    },
  },
  methods: {
    removeImage() {
      this.$emit("input", "");
    },
    handleUploadSuccess(res) {
      this.$emit("input", res.url);
      this.loading.close();
    },
    handleBeforeUpload() {
      this.loading = this.$loading({
        lock: true,
        text: "上传中",
        spinner: 'el-icon-loading',
        background: "rgba(0, 0, 0, 0.5)",
        customClass:'customClass'
      });
    },
    handleUploadError() {
      this.$message({
        type: "error",
        message: "上传失败",
      });
      this.loading.close();
    },
  },
  watch: {},
};
</script>

<style scoped lang="scss">
.image {
  position: relative;
  .mask {
    opacity: 0;
    position: absolute;
    top: 0;
    width: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    transition: all 0.3s;
  }
  &:hover .mask {
    opacity: 1;
  }
}
</style>