运用HTML5画布实现的超棒javascript动画仪表板：gauge.js

var opts = {
  lines: 12, // The number of lines to draw
  angle: 0.21, // The length of each line
  lineWidth: 0.44, // The line thickness
  pointer: {
    length: 0.9, // The radius of the inner circle
    strokeWidth: 0.108 // The rotation offset
  },
  colorStart: '#909090',   // Colors
  colorStop: '#8FC0DA',    // just experiment with them
  strokeColor: '#E0E0E0'   // to see which ones work best for you
};
var target = document.getElementById('foo'); // your canvas element
var gauge = new Gauge(target).setOptions(opts); // create sexy gauge!
gauge.maxValue = 3000; // set max gauge value
gauge.animationSpeed = 46; // set animation speed (32 is default value)
gauge.set(650); // set actual value

$.fn.gauge = function(opts) {
  this.each(function() {
    var $this = $(this),
        data = $this.data();

    if (data.gauge) {
      data.gauge.stop();
      delete data.gauge;
    }
    if (opts !== false) {
      data.gauge = new Gauge(this).setOptions(opts);
    }
  });
  return this;
};