浏览器锁频功能javascript代码

//浏览器锁频功能javascript代码，网上搜集，测试时效果没出来，不知道怎么回事，如果正常了，再贴完整的解决代码function showScreen(id) {//var Element = document.getElementById(id);var Elements = document.getElementById("Screen");alert(getWidth());Elements.style.width = getWidth();alert(getHeight());Elements.style.height = getHeight();//Element.style.display = "block";Elements.style.display = "block";}function hideScreen(id) {var Element = document.getElementById(id);var Elements = document.getElementById("Screen");Element.style.display = "none";Elements.style.display = "none";}function getWidth() {var strWidth, clientWidth, bodyWidth;clientWidth = document.documentElement.clientWidth;bodyWidth = document.body.clientWidth;if (bodyWidth > clientWidth) {strWidth = bodyWidth + 20;} else {strWidth = clientWidth;}return strWidth;}function getHeight() {var strHeight, clientHeight, bodyHeight;clientHeight = document.documentElement.clientHeight;bodyHeight = document.body.clientHeight;if (bodyHeight > clientHeight) {strHeight = bodyHeight + 50;} else {strHeight = clientHeight + 50;}return strHeight;}//以下是对应的div<div id="Screen" style="position:absolute;z-index: 9999;top: 0px;left: 0px;background:#CCC;display: none;filter: alpha(Opacity=1);">锁屏测试</div>