js prohibits numeric function code input on the small keyboard_javascript skills

Copy code The code is as follows:

function isNum()//Judge the number entered on the small keyboard
{
var str=(window.event.keyCode);
if(str>105 || str<96 )
{
if (str!=8 )
{
window .event.returnValue=false;
return;
}
}
}
function isNumUp()//Judge the main keyboard input number
{
var str=(window .event.keyCode);
if(str>57 || str<48 )
{
if (str!=8 )
{
window.event.returnValue=false;
return;
}
}
}

Test code:

Copy code The code is as follows: