微信小程序图片加载失败时替换为默认图片的方

<image class="userinfo-avatar" src="{{avatar}}" binderror="errorFunction"></image>

errorFunction: function(){
 this.setData({
  avatar: '/image/default.png'
 }) 
}

<view wx:for="{{imageList}}" wx:for-index="index" wx:for-item="item" wx:key="navItems">
  <image src="{{item.img}}" binderror="errorFunction" data-index='{{index}}' mode="widthFix" />
</view>

Page({
 /
  页面的初始数据
 /
 data: {
 imageList:[
  {
  id:1,
  name:'白金蜡',
  price:'60元/次',
  img:'/images/service/1.jpg'
  },
  {
  id: 2,
  name: '棕榈蜡',
  price: '90元/次',
  img: '/images/service/2.jpg'
  },
  {
  id: 3,
  name: '去污蜡',
  price: '90元/次',
  img: '/images/service/3.jpg'
  },
  {
  id: 4,
  name: '微镀晶',
  price: '138元/次',
  img: '/images/service/4.jpg'
  },
 ],
 },
 onLoad: function () {
 },
 //图片加载失败时
 errorFunction: function (event) {
 var index = event.currentTarget.dataset.index
 var img = 'imageList[' + index + '].img'
 this.setData({
  [img]: '/images/default.jpg'
 })
 }
})