文档进入/退出全屏

进入全屏
 1 if (document.documentElement.requestFullscreen) {
 2   // W3C
 3   docElm.requestFullscreen()
 4 } else if (docElm.mozRequestFullScreen) {
 5   // FireFox
 6   docElm.mozRequestFullScreen()
 7 } else if (docElm.webkitRequestFullScreen) {
 8   // Chrome等
 9   docElm.webkitRequestFullScreen()
10 } else if (docElm.msRequestFullscreen) {
11   // IE11
12   docElm.msRequestFullscreen()
13 }
退出全屏
14 if (document.exitFullscreen) {
15 　document.exitFullscreen()
16 } else if (document.mozCancelFullScreen) {
17   document.mozCancelFullScreen()
18 } else if (document.webkitCancelFullScreen) {
19   document.webkitCancelFullScreen()
20 } else if (document.msExitFullscreen) {
21   document.msExitFullscreen()
22 }