直接上代码：

全屏

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("WScript.Shell");if(wscript != null) {wscript.SendKeys("{F11}");}}
}
```退出全屏```javascript
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("WScript.Shell");if(wscript != null) {wscript.SendKeys("{F11}");}}
}

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