vue 设置图片默认值

	<template v-if="condition">
      <img
        :src="url"
        :onerror="defaultSrc"
      />
    </template>
    <template v-else>
      <img  :src="require('../assets/images/xxx.png')" />
    </template>

...
data() {
    return {
      defaultSrc:
        'this.src="' + require("../assets/images/xxx.png") + '"'
    };
  },
  props: {
    item: {
      type: Object,
      default() {
        return {};
      }
    },
    ...