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 IE，这里其实就是模拟了按下键盘的F11，使浏览器全屏
var wscript = new ActiveXObject("");
if(wscript != null) {
wscript.SendKeys("{F11}");
}
}
}
function exitFullScreen() {
var el = document;
var cfs = el.cancelFullScreen || el.webkitCancelFullScreen ||
el.mozCancelFullScreen || el.exitFullScreen;
if(typeof cfs != "undefined" && cfs) {
cfs.call(el);
} else if(typeof window.ActiveXObject != "undefined") {
//for IE，这里和fullScreen相同，模拟按下F11键退出全屏
var wscript = new ActiveXObject("");
if(wscript != null) {
wscript.SendKeys("{F11}");
}
}
}