function debounce(delay,fn){

    var timer;

    return function(){

        var ctx = this,args = arguments;

        clearTimeout(timer);

        timer = setTimeout(function(){

            fn.apply(ctx,args);

        },delay);

    }

}

function throttle(interval,fn){

    var last = 0;

    return function(){

        var cur = +new Date(),ctx = this,args = arguments;

        if(cur - last > interval){

            fn.apply(ctx,args);

            last = cur;

        }

    }

}