对画布进行动画处理以无限地对噪声进行动画处理，从而在 HTML 中呈现运动的外观

var ct = c.getContext("2d", {alpha: false});       // context without alpha channel.var a = ct.createImageData(c.width, c.height);  var buffer = new Uint32Array(a.data.buffer);  function loop() {   noise(ct);   requestAnimationFrame(loop)})()function noise(ct) {   var l =buffer.length - 1;   while(l--) buffer[l] = Math.random() <0.5 ?0 : -1>>0;   ct.putImageData(a, 0, 0);}