No images, no external CSS, No dependencies, Highly configurable, Resolution independant, Works in all major browsers, including IE6, Smaller than an animated GIF (2.8K minified, 1.7K gzipped)

使用方法：

var opts = {
  lines: 12, // The number of lines to draw
  length: 7, // The length of each line
  width: 5, // The line thickness
  radius: 10, // The radius of the inner circle
  color: '#000', // #rbg or #rrggbb
  speed: 1, // Rounds per second
  trail: 100, // Afterglow percentage
  shadow: true // Whether to render a shadow
};
var target = document.getElementById('foo');
var spinner = new Spinner(opts).spin(target);

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