[]请问移动端Chrome怎么设置全屏

function launchFullscreen(element)
{ if(element.requestFullscreen)
 { element.requestFullscreen(); 
} 
else if
(element.mozRequestFullScreen)
{ element.mozRequestFullScreen();
 } 
else if
(element.webkitRequestFullscreen) 
{ element.webkitRequestFullscreen();
 } 
else if
(element.msRequestFullscreen) 
{ element.msRequestFullscreen(); 
} } 
// 启动全屏! launchFullScreen(document.documentElement); 
// 整个网页 launchFullScreen(document.getElementById("videoElement")); // 某个页面元