用JSP做的网页，屏蔽了右键，如何启用右键的功能？

将<script></script>里的

document.oncontextmenu=new Function("event.returnValue=false")

document.onselectstart=new Function("event.returnValue=false")

两句删掉

<script language= "Javascript ">

//屏蔽鼠标右键、Ctrl+N、Shift+F10、F5刷新、退格键

//屏蔽F1帮助

function window.onhelp()

{

return false

}

function KeyDown()

{

//alert(event.keyCode)

//屏蔽 Alt+ 方向键 ← 屏蔽 Alt+ 方向键 →

if ((window.event.altKey)&&((window.event.keyCode==37)||(window.event.keyCode==39)))

{

//alert( "不准你使用ALT+方向键前进或后退网页！ ")

event.returnValue=false

}

//屏蔽退格删除键,屏蔽 F5 刷新键,Ctrl + R

if ((event.keyCode==116)||(event.ctrlKey && event.keyCode==82))

{

event.keyCode=0

event.returnValue=false

}

//屏蔽 Ctrl+n

if ((event.ctrlKey)&&(event.keyCode==78))

{

event.returnValue=false

}

//屏蔽 shift+F10

if ((event.shiftKey)&&(event.keyCode==121))

{

event.returnValue=false

}

//屏蔽 shift 加鼠标左键新开一网页

if (window.event.srcElement.tagName == "A " && window.event.shiftKey)

{

window.event.returnValue = false

}

//屏蔽Alt+F4

if ((window.event.altKey)&&(window.event.keyCode==115))

{

window.showModelessDialog( "about:blank ", " ", "dialogWidth:1pxdialogheight:1px ")

return false

}

//屏蔽Ctrl+A

if((event.ctrlKey)&&(event.keyCode==65))

{

return false

}

}

</script>

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