<FormItem label="上传头像" prop="image">
   <uploadImg :width="150" :height="150" :name="'avatar'" size="150px*150px" ref="avatar"></uploadImg>
</FormItem>
 <FormItem label="上传营业执照" prop="businessLicence">
 <uploadImg :width="350" :height="200" :name="'businessLicence'" size="350px*200px" ref="businessLicence"></uploadImg>
</FormItem>

/*
  子组件
*/
<template>
  <input type='file' @change="changeUrl" />
</template>
<script>
export default {
  methods: {
    changeUrl(e) {
      this.$emit('changeUrl', e.currentTarget.files[0].path)
    }
  }
}
</script>
/*
  父组件
*/
<template>
  <FormItem label="上传营业执照" prop="businessLicence">
    <uploadImg :width="350" :height="200" :name="'license'" size="350px*200px" @changeUrl="getUrl"></uploadImg>
  </FormItem>
</template>
<script>
export default {
  methods: {
    getUrl(path) {
      //这个就是你要的path,并且会双向绑定
    }
  }
}
</script>