JS implementation loading simple cover layer

Pop up a div to set the background color and transparency of the DIV
Remove this div or hide it when loading is complete
As for fading through settimeout or setinterval, try to change the transparency.

.test{      width : 100% ;      height : 100% ;      position : absolute ;      background-color : #5c5c5c ;      z-index : 100 ;      display : none ;      filter:Alpha(Opacity= 40 ,finishOpacity= 40 ,style= 0 ,startX= 100 ,startY= 100 ,finishX= 100 ,finishY= 100 ); } 这个是你说的灰色透明的背景，透明度什么的可以在那个滤镜中修改。 至于你说的淡入淡出效果就用setTimeout来做。  这个方法应该是显示这个界面和登陆成功后隐藏这个界面时条用。

JS implementation loading simple cover layer