SOURCE

var _showLoading = function(text) {
  $poploading = $('.pop-loading');
  if ($poploading.length == 0) {
    var $poploading = $("<div class='pop-loading'><div class='pop-loading-cnt'><div class='pop-loading-icon'></div><div class='pop-loading-text'></div></div></div>");
    $('body').prepend($poploading);
  }
  if ($poploading.css('display') == 'flex') return;
  $poploading.css('display', 'flex').find('.pop-loading-text').text(text || '正在加载中');
}

var _hideLoading = function() {
  $('.pop-loading').css('display', 'none');
}

$.extend(true, $, {
  showLoading: _showLoading,
  hideLoading: _hideLoading
});

$.showLoading();

setTimeout($.hideLoading, 300000);

html,
body {
  margin: 0;
  padding: 0;
}

.pop-loading {
  display: none;
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  z-index: 99999;
  justify-content: center;
  align-items: center;
}

.pop-loading-icon {
  width: 38px;
  height: 38px;
  background: url('data:image/svg+xml;base64,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');
  background-size: 100%;
  animation: weuiLoading 1s steps(12, end) infinite;
  -webkit-animation: weuiLoading 1s steps(12, end) infinite;
  margin: 30px auto 0;
}

.pop-loading-text {
  margin-top: 15px;
}

.pop-loading-cnt {
  width: 120px;
  min-height: 120px;
  background: rgba(17, 17, 17, .7);
  box-shadow: 0 0 6px 0 rgba(0, 0, 0, .2);
  border-radius: 5px;
  color: #fff;
  text-align: center;
}

@-webkit-keyframes weuiLoading {
  0% {
    transform: rotate3d(0, 0, 1, 0deg);
  }
  100% {
    transform: rotate3d(0, 0, 1, 360deg);
  }
}

@keyframes weuiLoading {
  0% {
    transform: rotate3d(0, 0, 1, 0deg);
  }
  100% {
    transform: rotate3d(0, 0, 1, 360deg);
  }
}