JS screen key effect and change the key effect of the sample code _javascript tips

Function Key f1-f2:112-123

A-b:65-90

Number key: 0-9:48-57

Esc:27

BACKSPACE: 8

Carriage return: 13

Shift:16;ctrl:17;alt:18

Space: 32

insert:45;delete:46

Copy Code code as follows:

function Document.onkeydown () {//web page press ENTER to trigger
if (event.keycode==13)
{
document.getElementById ("Loginbtn"). Click ();
return false;
}
}

document.onkeydown=mm_keypress;

function mm_keypress (num) {
Prevent system Backspace key
var keycode = Event.keycode;
if (keycode ==8)/Shield back bar once
{

Event.keycode = 0;
Event.returnvalue=false;
Return
}
if (keycode >=112 && keycode <=123)//Mask f1-12 function key
{

Event.keycode = 0;
Event.returnvalue=false;
Return
}
}