Vue 双向绑定

父页面引用

<ImagePreviewAndUpload v-model="addStationDialog.RuleForm.deliveryCompanyLogo"
                      @uploadSuccess="onHandleAddCompanyLogo"/>

回调方法

onHandleAddCompanyLogo(val){
        this.addStationDialog.RuleForm.deliveryCompanyLogo = val
},

自定义组件

<template>
  <div>
    <el-upload
      class="avatar-uploader"
      action="https://jsonplaceholder.typicode.com/posts/"
      :show-file-list="false"
      :on-success="handleAvatarSuccess"
      :before-upload="beforeAvatarUpload">
      <img v-if="imageUrl" :src="imageUrl" class="avatar">
      <i v-else class="el-icon-plus avatar-uploader-icon"></i>
    </el-upload>
  </div>
</template>
<script>
export default {
  name: 'ImagePreviewAndUpload',
  props:['value'],
  data(){
    return{
      imageUrl:this.value,
    }
  },
  methods: {
    handleAvatarSuccess(res, file) {
      this.imageUrl = URL.createObjectURL(file.raw);
      this.$emit('uploadSuccess',this.imageUrl)
    },
    beforeAvatarUpload(file) {
      const isGIF = file.type === 'image/gif';
      const isJPG = file.type === 'image/jpeg';
      const isPNG = file.type === 'image/png';
      const isLt2M = file.size / 1024 / 1024 < 2;

      if(!isJPG && !isPNG && !isGIF) {
        this.$message.error('上传头像图片只能是 JPG,PNG,GIF 格式!');
      }
      if(!isLt2M) {
        this.$message.error('上传头像图片大小不能超过 2MB!');
      }
      return (isJPG || isPNG || isGIF) && isLt2M;
    }
  }
}
</script>
<style>
.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: 100px;
  height: 100px;
  line-height: 100px;
  text-align: center;
}
.avatar{
  width: 100px;
  height: 100px;
  display: block;
}
</style>