html5css3背景下雪 HTML5 CSS3下雪奥运五环背景动画特效

HTML5 CSS3下雪奥运五环背景动画特效

代码片段：

var generateCanvasImageUrl = function generateCanvasImageUrl() {

var _window = window,

innerHeight = _window.innerHeight,

innerWidth = _window.innerWidth;

var pixels = innerHeight / 1 * (innerWidth / 1);

var $canvas = document.createElement('canvas');

var context = $canvas.getContext('2d');

$canvas.height = innerHeight / 1;

$canvas.width = innerWidth / 1;

for (var pixel = 0; pixel < pixels; pixel++) {

var x = pixel % innerWidth;

var y = Math.floor(pixel / innerWidth);

var size = Math.floor(Math.random() * 3 + 1);

context.fillStyle = '#fff';

if (Math.random() > 0.9999) context.fillRect(x, y, size, size);

}

return $canvas.toDataURL();

};

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