屏蔽Alt+F4等快捷键：<script>function KeyDown(){ //屏蔽鼠标右键、Ctrl+n、shift+F10、F5刷新、退格键 //alert("ASCII代码是："+event.keyCode); if ((window.event.altKey)&& ((window.event.keyCode==37) //屏蔽 Alt+ 方向键 ← (window.event.keyCode==39))){ //屏蔽 Alt+ 方向键 → alert("不准你使用ALT+方向键前进或后退网页！"); event.returnValue=false; } if ((event.keyCode==8) //屏蔽退格删除键 (event.keyCode==116) //屏蔽 F5 刷新键 (event.keyCode==112) //屏蔽 F1 刷新键 (event.ctrlKey && event.keyCode==82)){ //Ctrl + R event.keyCode=0; event.returnValue=false; if ((event.ctrlKey)&&(event.keyCode==78)) //屏蔽 Ctrl+n event.returnValue=false; if ((event.shiftKey)&&(event.keyCode==121)) //屏蔽 shift+F10 event.returnValue=false; if (window.event.srcElement.tagName == "A" && window.event.shiftKey) window.event.returnValue = false; //屏蔽 shift 加鼠标左键新开一网页 if ((window.event.altKey)&&(window.event.keyCode==115)){ //屏蔽Alt+F4 window.showModelessDialog("about:blank","","dialogWidth:1px;dialogheight:1px"); return false;}}function Showhelp(){ alert("Wrong!"); return false;} </script>
