(function($)
{
$.extend({

key_fn:[], //Holds the function corresponding to the bound character
key_code:[], //Hold characters
key_bind:function(ch,callback){
var KeyCode = {a:65,b:66,c:67,d:68,e:69,f:70,g:71,h:72,i:73,j:74,k:75,l:76,m:77,n:78,o:79,p:80,q:81,r:82,s:83,t:84,u:85,v:86,w:87,x:88,y:89,z:90};

if(KeyCode.hasOwnProperty(ch)){
$.key_fn.push(callback);
$.key_code.push(ch);
//The first time you need to add an event
if($.key_fn.length == 1){

$(document).keypress(function(e){
var e = event || window.event;
var k = e.keyCode || e.which;

for(var i =0 ; i < $.key_fn.length ;i++){

//-32 is lowercase compatible
if(k-32 == KeyCode[$.key_code[i]] || k == KeyCode[$.key_code[i]] ){
log('pressed binded key '+k);
$.key_fn[i]();
break;
}
}

});
}
}else
{
alert(' Binding events can only be letters ');
}
}

});
})(jQuery);

It can be used as follows

$.key_bind('f',set_table_full_screen);
$.key_bind('r',reloadthis);

Sometimes we need to add some shortcuts to the application, each time to write the following code, through key_bin is convenient to bind a certain keyboard and corresponding operation function.

$(document).keypress(function(){})