方法一：

function launchFullScreen() {

var element = document.documentElement;

if(element.requestFullScreen) {

element.requestFullScreen();

} else if(element.mozRequestFullScreen) {

element.mozRequestFullScreen();

} else if(element.webkitRequestFullScreen) {

element.webkitRequestFullScreen();

}

}

方法二：

function fullScreen() {

var el = document.documentElement;

var rfs = el.requestFullScreen || el.webkitRequestFullScreen || el.mozRequestFullScreen || el.msRequestFullScreen;

if (typeof rfs != "undefined" && rfs) {

rfs.call(el);

} else if (typeof window.ActiveXObject != "undefined") {

// for Internet Explorer

var wscript = new ActiveXObject("WScript.Shell");

if (wscript != null) {

wscript.SendKeys("{F11}");

}

}

}