详解vue更改头像功能实现

<div id="app">
 <div class="item_bock head_p">
   <div class="head_img">
    <img :src="userInfo.avatar"/>
    <--图片地址动态绑定-->
   </div>
   <div class="setting_right" @click.stop="uploadHeadImg">
    <div class="caption">更改头像</div>
   </div>
   <input type="file" accept="image/*" @change="handleFile" class="hiddenInput"/>
  </div>
 </div>

var app = new Vue({
 el: '#app',
 data: {
  userInfo: {
   avatar: 'https://gss0.bdstatic.com/-4o3dSag_xI4khGkpoWK1HF6hhy/baike/c0%3Dbaike92%2C5%2C5%2C92%2C30/sign=62d46c39067b020818c437b303b099b6/d4628535e5dde7119c3d076aabefce1b9c1661ba.jpg'
  }
  // 初始图片
 },
 methods: {
  // 打开图片上传
  uploadHeadImg: function () {
   this.$el.querySelector('.hiddenInput').click()
  },
  // 将头像显示
  handleFile: function (e) {
   let $target = e.target || e.srcElement
   let file = $target.files[0]
   var reader = new FileReader()
   reader.onload = (data) => {
    let res = data.target || data.srcElement
    this.userInfo.avatar = res.result
   }
   reader.readAsDataURL(file)
  },
 }
})

.item_bock {
 display: flex;
 align-items: center;
 justify-content: space-between;
 height:94px;
 width: 300px;
 padding:0px 24px 0px 38px;
 border-bottom: 1px solid #f7f7f7;
 background: #fff;
}
.head_p {
 height:132px;
}
.head_img{
 height: 90px;
}
.head_img img{
 width:90px;
 height:90px;
 border-radius:50px
}
.setting_right{
 display: flex;
 height: 37px;
 justify-content: flex-end;
 align-items: center;
}
.hiddenInput{
 display: none;
}
.caption {
 color: #8F8F8F;
 font-size: 26px;
 height: 37px;
}