让元素div消失在视野中

让元素div消失在视野中
1.position:absolute/relative/fixed  +  方位 top/bottom/left/right: -9999px
2.display:none
3.visibility:hidden
4.width:0 + overflow:hidden
  height:0 +  overflow:hidden
5.margin-top/bottom/left/right:-9999px;
6.background-color:transparent
7.opacity:0
8.transform: translateX(-9999px)/translateY(-9999px)/translate(-9999px,-9999px)
9.transform: scale(0)