JS sample code for blocking key effects and changing key effects_javascript skills

Function keys F1-F2: 112-123

a-b: 65-90

Number keys: 0-9: 48-57

ESC: 27

Backspace key: 8

Enter: 13

shift: 16; Ctrl: 17; Alt: 18

Space: 32

Insert: 45; Delete: 46

Copy code The code is as follows:

function document .onkeydown(){ //Triggered by pressing Enter in the webpage
if(event.keyCode==13)
{
document.getElementById("loginbtn").click();
return false;                                         

document.onkeydown=MM_KeyPress;

function MM_KeyPress(num){

//Prevent the system backspace key

var keycode = event.keyCode;

if(keycode ==8)//Shield the backspace key
{

event.keyCode = 0;
//event.returnValue=false;

return;

}
if(keycode >=112 && keycode <=123)//Shield f1 -12 function keys
{

event.keyCode = 0 ;
event.returnValue=false;

return;

}
}