Javascript disables keyboard function keys and makes right-click and other keys invalid_javascript tips

Copy code The code is as follows:

The red display above can be inserted into the web page to invalidate the right mouse click
onselectstart="return false" prohibits selection, ondragstart="return false" prohibits drag and drop, oncopy=document.selection.empty () Copying prohibited.

Disable saving: , placed in the head.

Disable pasting:

Turn off input method:

Disable the right mouse button:
function document.oncontextmenu(){event.returnValue=false;}

Disable F1 help:
function window.onhelp(){return false}

Block other keys

Copy code The code is as follows:

function document.onkeydown()
{
if ((window.event.altKey)&&
((window.event.keyCode==37)|| //Shield Alt arrow key←
(window.event.keyCode= =39))) //Block the Alt direction key→
{
alert("You are not allowed to use the ALT direction key to move forward or backward on the web!");
event.returnValue=false;
}
/* Note: This is not really shielding the Alt direction key.
Because when the Alt direction key pops up a warning box, hold down the Alt key.
Click the warning box with the mouse. This shielding method It fails. In the future,
if any expert has a real way to block the Alt key, please let me know. */
if ((event.keyCode==8) || //Shield the backspace delete key
(event.keyCode==116)|| //Shield the F5 refresh key
(event.ctrlKey && event.keyCode==82)){ //Ctrl R
event.keyCode=0;
event.returnValue=false;
}
if (event.keyCode==122){event .keyCode=0;event.returnValue=false;} //Shield F11
if (event.ctrlKey && event.keyCode==78) event.returnValue=false; //Shield Ctrl n
if (event. shiftKey && event.keyCode==121)event.returnValue=false; //Shield shift F10
if (window.event.srcElement.tagName == "A" && window.event.shiftKey)
window.event .returnValue = false; //Shield shift and left mouse button to open a new web page
if ((window.event.altKey)&&(window.event.keyCode==115)) //Shield Alt F4
{
window.showModelessDialog("about:blank","","dialogWidth:1px;dialogheight:1px");
return false;
}
}

Block printing:

Copy code The code is as follows: