Vue中怎么制作简单的图片上传与显示的功能

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vant中上传图片组件：https://youzan.github.io/vant/#/zh-CN/uploader

上传图片的组件uploader：

 <van-uploader :after-read="onRead" accept="image/*" multiple>
   <imgclass="head-img" src="/static/images/addpic.png" ref="goodsImg"/>
 </van-uploader>

method中

 methods: {
      //选择图片后执行
  onRead(file) {
     console.log(file);
     //将原图片显示为选择的图片
     this.$refs.goodsImg.src = file.content;
   }
 }

vant上传的图片是已经base64处理了的，可以直接向后台发了

补充知识：vue +vant + crodova实现图片上传、图片预览、图片删除

函数调用方法使用图片预览有坑，图片不显示

<template>
 <div class="add-check-page">
  <head-com :></head-com>
  <van-form @submit="onSubmit">
   <h2 class="van-doc-demo-block__title">添加照片</h2>
   <van-field name="uploader" class="pic-uploader">
    <template #input>
     <template v-for="(item, index) in file_path">
      <div class="item" :key="index">
       <van-image fit="cover" :src="IP + item" @click="preView(index)">
        <template v-slot:loading>
         <van-loading type="spinner" size="20" />
        </template>
       </van-image>
       <van-icon name="close" @click="delPic(index)" />
      </div>
     </template>
     <van-icon class="up-btn" @click="picture" :name="require('#/images/add_check_icon.png')" />
     <van-uploader id="photo" multiple :after-read="afterRead" style="display:none">
      <van-button
       class="up-btn"
       :icon="require('#/images/add_check_icon.png')"
       type="default"
      />
     </van-uploader>
    </template>
   </van-field>
   <van-button class="save" block type="default" native-type="submit">确认提交</van-button>
  </van-form>
  <van-action-sheet
   v-model="show"
   :actions="actions"
   @select="onSelect"
   cancel-text="取消"
   close-on-click-action
  />
  <loading :showLoading="showLoad"></loading>
  // 使用函数调用图片预览方法，图片无法显示所以改用组件调用
  <van-image-preview
   v-if="imgShow"
   v-model="imgShow"
   :images="preList"
   :start-position="startIndex"
   @closed="handleClose"
  ></van-image-preview>
 </div>
</template>
<script>
import headCom from '_c/header/index.vue'
import loading from '_c/loading/index.vue'
export default {
 components: {
  headCom,
  loading
 },
 data() {
  return {
   //  公司id
   id: '',
   id2: '',
   title: '',
   file_name: [],
   file_path: [],
   content: '',
   show: false,
   actions: [{ name: '拍摄' }, { name: '从手机相册选择' }],
   showLoad: false,
   imgPre: '',
   imgShow: false,
   preList: [],
   startIndex: 0
  }
 },
 beforeRouteLeave(to, from, next) {
  if (this.imgPre) {
   this.imgPre.close()
  }
  next()
 },
 created() {
  this.id = this.$route.params.id
  if (this.$route.name === 'editCheck') {
   this.title = '编辑记录'
   this.getInfo()
  } else {
   this.title = '添加记录'
  }
 },
 methods: {
  async getInfo() {
   this.showLoad = true
   try {
    let data = {
     id: this.id
    }
    let res = await this.$api.check.edit(data)
    this.content = res.detail.content
    this.id2 = res.detail.company_id
    res.photo_list.forEach((item) => {
     this.file_name.push(item.file_name)
     this.file_path.push(item.file_path)
    })
    this.showLoad = false
   } catch (error) {
    this.showLoad = false
    this.$toast(error.msg)
   }
  },
  async onSubmit(values) {
   this.showLoad = true
   try {
    let data = {}
    if (this.$route.name === 'editCheck') {
     data = {
      id: this.id,
      company_id: this.id2,
      content: values.content,
      file_names: [...this.file_name],
      file_paths: [...this.file_path]
     }
     await this.$api.check.editPost(data)
    } else {
     // 添加
     data = {
      company_id: this.id,
      content: values.content,
      file_names: [...this.file_name],
      file_paths: [...this.file_path]
     }
     await this.$api.check.addPost(data)
    }
    this.showLoad = false
    this.$router.go(-1)
   } catch (error) {
    this.$toast(error.msg)
   }
  },
  // 删除图片
  delPic(index) {
   this.file_path.splice(index, 1)
   this.file_name.splice(index, 1)
  },
  // 图片预览
  preView(index) {
   this.startIndex = index
   this.preList = []
   this.file_path.forEach((item) => {
    this.preList.push(this.IP + item)
   })
   this.imgShow = true
  },
  // 关闭预览
  handleClose() {
   this.preList = []
   this.imgShow = false
  },
  async afterRead(file) {
   this.showLoad = true
   try {
    if (file.length) {
     file.forEach(async (item) => {
      let res = await this.$api.base.upload(item)
      this.file_name.push(res.name)
      this.file_path.push(res.url)
      this.showLoad = false
     })
    } else {
     let res = await this.$api.base.upload(file)
     this.file_name.push(res.name)
     this.file_path.push(res.url)
     this.showLoad = false
    }
   } catch (e) {
    this.showLoad = false
    this.$toast(e.data)
   }
  },
  picture() {
   this.show = true
  },
  // 选择添加图片方式
  onSelect(item) {
   this.show = false
   if (item.name === '拍摄') {
    this.takePhoto()
   } else {
    let dl = document.getElementById('photo')
    dl.click()
   }
  },
  // 拍照上传
  takePhoto() {
   let that = this
   // crodova 调取相机拍照
   navigator.camera.getPicture(success, error, {})
   function success(imageURI) {
    that.showLoad = true
    // file uri 上传服务器
    that.fileUpload(imageURI)
   }
   function error() {
    this.$toast('打开相机失败')
   }
  }，
  // 使用cordova FileUpload上传图片
  fileUpload: function(imageURI) {
   let that = this
   let FileUploadOptions = window.FileUploadOptions
   let FileTransfer = window.FileTransfer
   let options = new FileUploadOptions()
   options.fileKey = 'file'
   options.fileName = imageURI.substr(imageURI.lastIndexOf('/') + 1)
   options.mimeType = 'image/jpeg'
   let ft = new FileTransfer()
   ft.upload(imageURI, encodeURI(this.API + '/user/uploadImg'), function(data) {
    let resString = data.response
    let resObject = JSON.parse(resString) // 字符串转对象
    if (resObject.code === 1) {
     that.file_name.push(resObject.data.name)
     that.file_path.push(resObject.data.url)
     that.showLoad = false
    } else {
     that.showLoad = false
     that.$toast(resObject.msg)
    }
   })
  }
 }
}
</script>