vue.js 图片上传并预览及图片更换功能的实现代码

这里讲解是图片上传和图片预览。主要是围绕我们常用功能的列子做讲解 ,并且没有格外引入其他js 所以你复制过去做简单修改便可以看到效果

效果图：

样式以及效果图一并展示

1.html

<div class="rz-picter">
             <img :src="avatar" class="img-avatar">
  <input type="file" name="avatar" id="uppic" accept="image/gif,image/jpeg,image/jpg,image/png" @change="changeimage($event)" ref="avatarinput" class="uppic">
  </div>

2.js

data() {
       return {
         avatar: require('../assets/jia.jpg'),
      }
     },

图片一定要以require 的方式引入 这里的图片仅用来美化 并不是上传的图片

3.js 写方法

 changeimage(e) {
         var file = e.target.files[0]
         var reader = new filereader()
         var that = this
         reader.readasdataurl(file)
         reader.onload = function(e) {
           that.avatar = this.result
         }
       },

就这么几段代码一个上传功能就写好了

4.切记我这里用了css来将input  type = file 的样式重新优化了，并且将图片做了定位 所以点击中间图片就可以触发上传

你需要你的需求去定义你的样式

5.运用原生javascript我做了一个判断图片是否上传的的判断

if(document.getelementbyid('uppic').value.length == '') {
           toast('请上传图片');
           return
 }

6.附上css代码

  .uppic {
     height: 3rem;
     width: 6rem;
     margin: 0 auto;
     opacity: 0;
     z-index: 99999;
   }
   .img-avatar {
     position: absolute;
   }

附上写此功能所有代码

<template>
 <div class="renzheng">
 <div class="rz-notice" v-bind:style="{ display: isno}">
  <p>名片用来鉴别是相关人员，温馨提示：<img src="../assets/static/img-icon/lan_cha.png" @click="hiddenwords"></p>
 </div>
 <van-tabs v-model="active" swipeable>
  <van-tab v-for="(item,index) in navarr" :title="item.name" class="v-tab">
  <div v-if="index==0">
   <div class="color-black" style="text-align: center;margin-top: 0.4rem;">请上传本人名片照片</div>
   <div class="rz-picter">
   <img :src="avatar" class="img-avatar">
   <input type="file" name="avatar" id="uppic" accept="image/gif,image/jpeg,image/jpg,image/png" @change="changeimage($event)" ref="avatarinput" class="uppic">
   </div>
   <div class="cuxian"></div>
   <div class="my-content-list">
   <div class="color-black"><span style="margin-right: 0.6rem;">真实姓名:</span><input v-model="yoursname" placeholder="请输入您的真实姓名" /></div>
   </div>
   <div class="my-content-list">
   <div class="color-black"><span style="margin-right: 0.6rem;">手机号码:</span><input type="number" max="11" v-model="yoursphone" placeholder="请输入您的手机号码" /></div>
   </div>
   <div class="yzbtn" @click="submitbtn">
   立即认证
   </div>
  </div>
  <div v-if="index==1">
   <div class="color-black" style="text-align: center;margin-top: 0.4rem;">请上传本人身份证照片</div>
   <div class="rz-picter">
   <img src="../assets/jia.jpg" />
   <p>上传人像页</p>
   </div>
   <div class="rz-picter">
   <img src="../assets/jia.jpg" />
   <p>上传国辉页</p>
   </div>
   <div class="cuxian"></div>
   <div class="my-content-list">
   <div class="color-black"><span style="margin-right: 0.6rem;">真实姓名:</span><input placeholder="请输入您的真实姓名" /></div>
   </div>
   <div class="my-content-list">
   <div class="color-black"><span style="margin-right: 0.6rem;">手机号码:</span><input type="number" placeholder="请输入您的手机号码" /></div>
   </div>
   <div class="yzbtn">
   立即认证
   </div>
  </div>
  </van-tab>
 </van-tabs>
 </div>
</template>
<script>
 import { tab, tabs } from 'vant';
 import { toast } from 'vant'
 export default {
 name: 'renzheng',
 data() {
  return {
  yoursname: '',
  yoursphone: '',
  avatar: require('../assets/jia.jpg'),
  isno: 'block',
  active: 0,
  navarr: [{
   name: "身份认证"
   },
   {
   name: "实名认证"
   }
  ],
  }
 },
 methods: {
  hiddenwords() {
  this.isno = 'none'
  },
  submitbtn() {
  if(this.yoursname == '') {
   toast("请填写你的真实姓名");
   return;
  }
  if(this.yoursphone == '' || this.yoursphone == null) {
   toast("请填写你的手机号码");
   return;
  }
  if(document.getelementbyid('uppic').value.length == '') {
   toast('请上传图片');
   return;
  }
  },
  changeimage(e) {
  var file = e.target.files[0]
  var reader = new filereader()
  var that = this
  reader.readasdataurl(file)
  reader.onload = function(e) {
   that.avatar = this.result
  }
  },
 },
 mounted: function() {
 }
 }
</script>
<style>
 .rz-notice {
 padding: 0.2rem 0.3rem;
 display: flex;
 flex-direction: row;
 justify-content: space-between;
 align-items: center;
 background: #f0f5fb;
 color: #28d9ef;
 }
 
 .rz-notice img {
 height: 0.22rem;
 width: 0.22rem;
 }
 
 .rz-picter {
 height: 3rem;
 width: 6rem;
 margin: 0.3rem auto;
 border: 0.01rem solid #ededed;
 display: flex;
 flex-direction: column;
 align-items: center;
 justify-content: center;
 }
 
 .uppic {
 height: 3rem;
 width: 6rem;
 margin: 0 auto;
 opacity: 0;
 z-index: 99999;
 }
 .img-avatar {
 position: absolute;
 }
 /*立即验证*/
 
 .yzbtn {
 width: 90%;
 height: 0.8rem;
 background: #ff6600;
 border-radius: 0.06rem;
 margin: 30px auto;
 text-align: center;
 line-height: 0.8rem;
 color: #ffffff
 }
 
 
 /*修改原有tab样式*/
 
 .van-tab {
 color: #a3a3a3!important;
 }
 
 .van-tab--active {
 color: #000!important;
 }
 
 .van-tabs__line {
 background-color: #ff6600!important;
 width: 0.7rem!important;
 text-align: center!important;
 align-items: center;
 margin-left: 1.5rem;
 }
 
 .van-toast {
 background-color: #ff6600;
 color: #ffffff
 }
 
 .my-content-list {
 padding: 0.3rem;
 display: flex;
 flex-direction: row;
 justify-content: space-between;
 border-bottom: 0.01rem solid #ededed;
 }
</style>

总结

以上所述是小编给大家介绍的vue.js 图片上传并预览及图片更换功能的实现代码，希望对大家有所帮助