Remmys Codeschnipsel

function timestamp() {
if (window.performance && window.performance.now){
return window.performance.now();
} else {
return new Date().getTime();
}
}

var fps = 60,
step = 1/fps,
dt = 0,
now,
last = timestamp();

function frame() {
now = timestamp();
dt = dt + Math.min(1, (now - last) / 1000);
while(dt > step) {
dt = dt - step;
update(step);
}
render(ctx, dt);
last = now;
requestAnimationFrame(frame, canvas);
}
frame();

/* ======================================================== */

function timestamp() {
if (window.performance && window.performance.now){
return window.performance.now();
}
else {
return new Date().getTime();
}
}

var fps = 60,
step = 1 / fps,
dt = 0,
now,
last = timestamp();

function frame() {
now = timestamp();
dt = dt + Math.min(1, (now - last) / 1000);
while (dt > step) {
dt = dt - step;
update();
}
render(ctx);
last = now;
requestAnimationFrame(frame);
}

/* ===================================================== */

var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");