key press function to perform system function

document.onkeyup = function(e) {
  if (e.which == 77) {
    alert("M key was pressed");
  } else if (e.ctrlKey && e.which == 66) {
    alert("Ctrl + B shortcut combination was pressed");
  } else if (e.ctrlKey && e.altKey && e.which == 89) {
    alert("Ctrl + Alt + Y shortcut combination was pressed");
  } else if (e.ctrlKey && e.altKey && e.shiftKey && e.which == 85) {
    alert("Ctrl + Alt + Shift + U shortcut combination was pressed");
  }
};

<script>

$(document).ready(function () {

$('[data-toggle="tooltip"]').tooltip();

$(document).keyup(function (e)

{

var name=e.key;

// console.log(e.which);

// if(e.shiftKey && e.which == 80)

// {

// }

// alert(name);

switch(e.key){

case 'Escape':

var l= document.getElementById("gotohome");

l.click();

break;

case 'B':

var l= document.getElementById("printbill");

l.click();

break;

/* case 'F2':

var l= document.getElementById("observation");

l.click();

break;*/

case 'S':

var l= document.getElementById("printsticker");

l.click();

break;

/* case 'F4':

alert("hasdl");

// var l= document.getElementById("submit");

// l.click();

break;*/

/* case 'F8':

alert("F8 ho ma");

/!*

var l= document.getElementById("submit");

l.click();*!/

break;*/

// default: // this step is important to reset

// console.log(e.key);

}

});

});

</script>