• ajax 文件入口
• 消息队列
• elementui loading参数设置
• 基于elementui的loading全局加载
• 应用场景
• 1.引入库
• 2.定义全局loading
• 3.使用

/**
 * @param {string} url 请求 `url` 地址
 * @param {object, array, formdata} params 参数数据
 * @param {object, array, formdata} query url 拼接参数
 * @param {string} method post, get, add, delete
 * @param {boolean} notice false: 默认, 不直接显示返回消息 ------- fixme 待确认
 */
const ajax = ({ url, data = {}, query = {}, method = 'post', notice = false, type = '' }) => {
  // 默认url 地址携带 参数
  const default_query = {
    pinuuid: store.getters.pinuuid,
    ebiid: store.getters.ebiid
  }
  query = object.assign(query, default_query)
  url = urlqueryformat(url, query)

  data.pinuuid = store.getters.pinuuid
  data = object.assign(data, default_query)
  // 过滤重复的请求 事件
  // eslint-disable-next-line no-unused-vars
  const repeat = messagelist.findrepeat(url, data, method)
  // if (repeat.length > 0) {
  // eslint-disable-next-line no-constant-condition
  if (false) {
    message.warning('数据正在获取中, 请稍后...')
    return promise.reject({ message: '数据正在获取中, 请稍后...' })
  } else {
    // 获取 分配的 rid 即 index
    const rid = messagelist.add(url, data, method)

    return new promise((resolve, reject) => {
      // eslint-disable-next-line prefer-const
      let reqstate = { url, method }
      if (method.tolowercase() === 'get') reqstate['params'] = data
      else if (method.tolowercase() === 'post') {
        reqstate['data'] = data
        if (type === 'x_www_form_urlencoded') {
          request.defaults.headers.post['content-type'] = httpconstant.form_data_req
          let ret = ''
          for (const it in reqstate) {
            ret += encodeuricomponent(it) + '=' + encodeuricomponent(reqstate[it]) + '&'
          }
          reqstate['data'] = ret
        } else if (type === 'form_data') {
          request.defaults.headers.post['content-type'] = httpconstant.mul_form_req
        } else if (type === 'blob') {
          request.defaults.headers.post['content-type'] = httpconstant.application_blob_req
          reqstate.responsetype = type
        } else {
          request.defaults.headers.post['content-type'] = httpconstant.form_data_req
        }
      }

      request(reqstate).then(res => {
        // settimeout(() => { // 测试用 fortest
        messagelist.del(rid)
        resolve(res)
        // }, 1000 * 2)
      }).catch(err => {
        // 当请求错误 是否需要重新发包 网络错误等 处理
        messagelist.del(rid)
        reject(err)
      })
    })
  }
}

/** loading 队列 */
const messagelist = {
  loading: null,
  timer: null,
  state: {},
  add(url, params, method) {
    let rid = 0
    while (this.state[rid]) { ++rid }
    this.state[rid] = {
      rid,
      data: json.stringify({ url, params, method })
    }

    this.loading = loading.service(loadingoption)
    this.inittimer()
    return rid
  },
  // url 作为key
  del(rid) {
    delete this.state[rid]
    if (object.values(this.state).length <= 0) { this.closeloading() }
  },
  findrepeat(url, params, method) {
    // 获取重复相同请求
    return object.values(this.state).filter(item => {
      return item.data === json.stringify({ url, params, method })
    }).map(item => { return { ...item, ...{ data: json.parse(item.data) }} })
  },
  inittimer() {
    if (this.timer) { cleartimeout(this.timer) }
    // 延迟 3s 强制close loading 状态
    this.timer = settimeout(() => {
      message.error('请求超时, 自动关闭')
      if (this.loading) this.loading.close()
    }, 1000 * 5)
  },
  closeloading() {
    if (this.loading) this.loading.close()
    cleartimeout(this.timer)
  }
}

const loadingoption = {
  lock: true,
  text: 'loading',
  spinner: 'el-icon-loading',
  background: 'rgba(0, 0, 0, 0.7)'
}

const httpconstant = {
  // 请求content-type类型
  'form_data_req': 'application/x-www-form-urlencoded',
  'application_json_req': 'application/json',
  'mul_form_req': 'multipart/form-data',
  'application_blob_req': 'application/vnd.ms-excel;charset=utf-8',
}

import { loading } from 'element-ui'

/* 全局多彩加载层 */
vue.prototype.$basecolorfullloading = (wer) => {
  const loading = loading.service({ // 声明一个loading对象
    lock: true, // 是否锁屏
    text: '正在加载...', // 加载动画的文字
    spinner: 'inner-circles-loader', // 引入的loading图标
    background: 'hsla(0,0%,100%,0)', // 背景颜色
    target: document.queryselector(wer)
  })
  settimeout(function() { // 设定定时器，超时5s后自动关闭遮罩层，避免请求失败时，遮罩层一直存在的问题
     loading.close() // 关闭遮罩层
   }, 2000000)
  return loading
}

//添加class="todolist"
<el-table
	:data="currenttabledata"
	class="todolist"
	size="small"
	style="width: 100%"
	highlight-current-row
	@row-click="handleselectionchange">
 </el-table>

// 请求时调用
const loading = this.$basecolorfullloading('.app-main')
//请求完成后关闭
loading.close()