vue 图片上传

Posted 2020-11-29 cczlovexw

功能说明：

1、调用手机拍照功能

2、调用相册功能

3、图片上传功能

4、图片预览功能

5、图片删除功能

记录个多图上传组件，关键点：
1、input 新增multiple
2、accept="image/*处理ios、安卓手机启用摄像头
3、根据createObjectURL处理图片预览
4、formData构造函数创建空对象
5、通过formData.getAll()，把文件流数据转为数组

组件示例图

 

组件代码 upload_img.vue

<template>
  <div class="content">
    <div class="imgBox">
      <div class="uploadBox" v-for="(value, key) in imgs" :key="‘uploadBox‘ + key">
        <img :src="getObjectURL(value)" alt="" class="uploadImg">
        <img src="../../assets/images/icon_x.png" alt="" class="closeImg" @click=‘delImg(key)‘>
      </div>
      <div class="inputButton">
      <img src="../../assets/images/icon_photo.png" alt="" class="addImg">
        <input type="file" class="upload" @change="addImg" ref="inputer" multiple
          accept="image/*"/>
      </div>
      <div class="submitTask" @click="submit">
        上传图片
      </div>
    </div>
  </div>
</template>

 

js：

export default ({
  name: ‘uploadPicture‘,
  data: function() {
    return {
      formData: new FormData(),
      imgs: {},
      imgLen: 0,
      txtVal: 0,
      desc: ‘‘

    }
  },
  created() {

  },
  methods: {
    descInput() {
      // this.txtVal = this.desc.length;
    },
    addImg(event) {
      let inputDOM = this.$refs.inputer
      // 通过DOM取文件数据
      this.fil = inputDOM.files
      // console.log(inputDOM.files)
      let oldLen = this.imgLen
      for (let i = 0; i < this.fil.length; i++) {
        let size = Math.floor(this.fil[i].size / 1024)
        if (size > 5 * 1024 * 1024) {
          alert(‘请选择5M以内的图片！‘)
          return false
        }
        this.imgLen++
        this.$set(this.imgs, this.fil[i].name + ‘?‘ + new Date().getTime() + i, this.fil[i])
        // console.log(this.imgs)
      }
      console.log(‘this.fil‘, this.fil)
      // this.imgs = this.fil
    },
    getObjectURL(file) {
      var url = null
      if (window.createObjectURL !== undefined) { // basic
        url = window.createObjectURL(file)
      } else if (window.URL !== undefined) { // mozilla(firefox)
        url = window.URL.createObjectURL(file)
      } else if (window.webkitURL !== undefined) { // webkit or chrome
        url = window.webkitURL.createObjectURL(file)
      }
      return url
    },
    delImg(key) {
      this.$delete(this.imgs, key)
      this.imgLen--
    },
    // 提交上传图片
    submit() {
      for (let key in this.imgs) {
        let name = key.split(‘?‘)[0]
        this.formData.append(‘file‘, this.imgs[key])
      }
      this.formData.getAll(‘file‘)
      console.log(‘this.formData‘, this.formData)
      this.$refund.upload(this.formData)
    }
  }
})
</script>

说明：

    图片上传完成后，使用getObjectURL来作预览功能处理。

温馨提示： 

formData.getAll最后返回来的是一个数组

样式：

<style lang="less">
// 外部盒子样式
.content {
  width: 100%;
  padding: 0.16rem 0 !important;
  .imgBox {
    display: flex;
    display: -webkit-flex;
    flex-direction: row;
    justify-content: flex-start;
    align-items: center;
    flex-wrap: wrap;
  }
}

// 预览图片样式
.uploadBox {
  position: relative;
  width: 30%;
  text-align: left;
  margin-right: 0.1rem;
  margin-bottom: 0.05rem;
  // 预览样式
  .uploadImg {
    width: 100%;
    height: 100%;
    display: block;
    overflow: hidden;
  }
  // 删除按钮
  .closeImg {
    width: 0.2rem;
    height: 0.2rem;
    position: absolute;
    top: 2%;
    right: 1%;
  }
}
// 上图图片icon
.inputButton {
  position: relative;
  display: block;
  width: 1.2rem;
  height: 1.2rem;
  // 上传图片样式
  .addImg {
    display: block;
    width: 1.2rem;
    height: 1.2rem;
  }
  // input样式
  .upload {
    width: 1.2rem;
    height: 1.2rem;
    opacity: 0;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 100;
  }
}
// 提交按钮
.submitTask {
    margin: auto;
    background: #EF504D;
    width: 30%;
    height: 0.3rem;
    color: #fff;
    font-size: 0.16rem;
    line-height: 0.3rem;
    text-align: center;
    border-radius: 0.1rem;
    margin-top: 0.8rem;
}
</style>

 

 

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