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/ 屏蔽刷新代码
document.onkeydown=function()
{
if ((window.event.keyCode==116) || //屏蔽 F5
(window.event.keyCode==122) || //屏蔽 F11
(window.event.shiftKey && window.event.keyCode==121) //shift+F10
)
{
window.event.keyCode=0;
window.event.returnValue=false;
}
if ((window.event.altKey)&&(window.event.keyCode==115)) { //屏蔽Alt+F4
window.showModelessDialog("about:blank","","dialogWidth:1px;dialogheight:1px");
return false;
}
}