Vue的移动端多图上传插件vue-easy-uploader的示例代码(2)

ready # 上传开始前的准备状态 
selected # 已选择上传文件 
uploading # 开始上传 
finished # 上传完毕 

methods: {
 upload () {
  this.$store.commit('set_img_status', 'uploading')
 },
 submit () {
  // some code
 }
}
computed: {
 ...mapState({
  imgStatus: state => state.imgstore.img_status
 })
},
watch: {
 imgStatus () {
  if (this.imgStatus === 'finished') {
   this.submit()
  }
 }
}

// Created by quanzaiyu on 2017/10/25 0025.
var state = {
 img_upload_cache: [],
 img_paths: [],
 img_status: 'ready' // 上传状态 ready selected uploading finished
}

const actions = {}

const getters = {}

const mutations = {
 set_img_upload_cache (state, arg) {
  state.img_upload_cache = arg
 },
 set_img_paths (state, arg) {
  state.img_paths = arg
 },
 set_img_status (state, arg) {
  state.img_status = arg
 }
}

export default {
 state,
 mutations,
 actions,
 getters
}

<template>
 <div class="imgUploader">
  <div class="file-list">
   <section
    v-for="(file, index) in imgStore" :key="index"
    class="file-item draggable-item"
   >
    <img :src="file.src" alt="" ondragstart="return false;">
    <span class="file-remove" @click="remove(index)">+</span>
   </section>
   <section class="file-item" v-if="imgStatus !== 'finished'">
    <div class="add">
     <span>+</span>
     <input type="file" pictype='30010003' multiple
      data-role="none" accept="image/*"
      @change="selectImgs"
      ref="file"
     >
    </div>
   </section>
  </div>
  <div class="uploadBtn">
   <section>
    <span v-if="imgStore.length > 0" class="empty"
     @click="empty">
      {{imgStatus === 'finished' ? '重新上传' : '清空'}}
    </span>
   </section>
  </div>
 </div>
</template>

<script>
import { mapState } from 'vuex'
export default {
 props: ['url'],
 data () {
  return {
   files: [], // 文件缓存
   index: 0 // 序列号
  }
 },
 computed: {
  ...mapState({
   imgStore: state => state.imgstore.img_upload_cache,
   imgPaths: state => state.imgstore.img_paths,
   imgStatus: state => state.imgstore.img_status
  })
 },
 methods: {
  // 选择图片
  selectImgs () { # ①
   let fileList = this.$refs.file.files
   for (let i = 0; i < fileList.length; i++) {
    // 文件过滤
    if (fileList[i].name.match(/.jpg|.gif|.png|.bmp/i)) { 
     let item = {
      key: this.index++,
      name: fileList[i].name,
      size: fileList[i].size,
      file: fileList[i]
     }
     // 将图片文件转成BASE64格式
     let reader = new FileReader() # ②
     reader.onload = (e) => {
      this.$set(item, 'src', e.target.result)
     }
     reader.readAsDataURL(fileList[i])
     this.files.push(item)
     this.$store.commit('set_img_upload_cache', this.files) // 存储文件缓存
     this.$store.commit('set_img_status', 'selected') // 更新文件上传状态
    }
   }
  },
  // 上传图片
  submit () {
   let formData = new FormData() # ③
   this.imgStore.forEach((item, index) => {
    item.name = 'imgFiles[' + index + ']' # ④
    formData.append(item.name, item.file)
   })
   formData.forEach((v, k) => console.log(k, ' => ', v))
   // 新建请求
   const xhr = new XMLHttpRequest() # ⑤
   xhr.open('POST', this.url, true)
   xhr.send(formData)
   xhr.onload = () => {
    if (xhr.status === 200 || xhr.status === 304) {
     let datas = JSON.parse(xhr.responseText)
     console.log('response: ', datas)
     // 存储返回的地址
     let imgUrlPaths = new Set()  # ⑥
     datas.forEach(e => { // error === 0为成功状态
      e.error === 0 && imgUrlPaths.add(e.url)
     })
     this.$store.commit('set_img_paths', imgUrlPaths) // 存储返回的地址
     this.files = [] // 清空文件缓存
     this.index = 0 // 初始化序列号
     this.$store.commit('set_img_status', 'finished') // 更新文件上传状态
    } else {
     alert(`${xhr.status} 请求错误!`)
    }
   }
  },
  // 移除图片
  remove (index) {
   this.files.splice(index, 1)
   this.$store.commit('set_img_upload_cache', this.files) // 更新存储文件缓存
  },
  // 清空图片
  empty () {
   this.files.splice(0, this.files.length)
   this.$store.commit('set_img_upload_cache', this.files) // 更新存储文件缓存
   this.$store.commit('set_img_paths', [])
  }
 },
 beforeCreate () {
  this.$store.commit('set_img_status', 'ready') // 更新文件上传状态
 },
 destroyed () {
  this.$store.commit('set_img_upload_cache', [])
  this.$store.commit('set_img_paths', [])
 },
 watch: {
  imgStatus () {
   if (this.imgStatus === 'uploading') {
    this.submit()  # ⑦
   }
  },
  imgStore () {
   if (this.imgStore.length <= 0) {
    this.$store.commit('set_img_status', 'ready') // 更新文件上传状态
   }
  }
 }
}
</script>

<style lang="less" scoped>
...
</style>