var ex,y,c,d; var alpha; function sample(){ ex=100; c=0; d=0; alpha=0.5; w=0.2; r=0.3; var timer; var delay = 1000; var loop = function () { y=ex+c+d; c=w*y; d=alpha*y; $("#memo").html(y); clearTimeout(timer); timer = setTimeout(loop, delay); } loop(); }