loading组件https://www.cnblogs.com/chenguiya/p/11383447.html -

let needLoadingRequestCount = 0
let loading
export function startLoading() {
  loading = Loading.service({
    lock: true,
    text: '拼命加载中',
    spinner: 'el-icon-loading',
    background: 'rgba(0, 0, 0, 0.2)',
    customClass: 'custom_loading_class'
  })
}
export function endLoading() {
  loading.close()
}

export function showFullScreenLoading() {
  if (needLoadingRequestCount === 0) {
    startLoading()
  }
  needLoadingRequestCount++
}

export function tryHideFullScreenLoading() {
  if (needLoadingRequestCount <= 0) return
  needLoadingRequestCount--
  if (needLoadingRequestCount === 0) {
    endLoading()
  }
}