xhr.js

xhr.js

var xhr = function(){
    var xhr = new XMLHttpRequest();
    return function( method, url, param, callback ){
        xhr.onreadystatechange = function(){
            if ( xhr.readyState === 4 ){
				callback( xhr.responseText );
            }
        };
        xhr.open( method, url+(method==="get" ? "?"+param : ""), true );
        xhr.setRequestHeader( "Content-Type", "application/x-www-form-urlencoded" );
        xhr.send( method==="post" ? param : "" );
    };
}();