常用函数

easings-functions.js

var easings = (function() {
    var eases = {};
    var names = ['Quad', 'Cubic', 'Quart', 'Quint', 'Expo'];
    var functions = {
      Sine: function(t) { return 1 - Math.cos( t * Math.PI / 2 ); },
      Circ: function(t) { return 1 - Math.sqrt( 1 - t * t ); },
      Elastic: function(t, m) {
        if( t === 0 || t === 1 ) return t;
        var p = (1 - Math.min(m, 998) / 1000), st = t / 1, st1 = st - 1, s = p / ( 2 * Math.PI ) * Math.asin( 1 );
        return -( Math.pow( 2, 10 * st1 ) * Math.sin( ( st1 - s ) * ( 2 * Math.PI ) / p ) );
      },
      Back: function(t) { return t * t * ( 3 * t - 2 ); },
      Bounce: function(t) {
        var pow2, bounce = 4;
        while ( t < ( ( pow2 = Math.pow( 2, --bounce ) ) - 1 ) / 11 ) {}
        return 1 / Math.pow( 4, 3 - bounce ) - 7.5625 * Math.pow( ( pow2 * 3 - 2 ) / 22 - t, 2 );
      }
    }
    names.forEach(function(name, i) {
      functions[name] = function(t) {
        return Math.pow( t, i + 2 );
      }
    });
    Object.keys(functions).forEach(function(name) {
      var easeIn = functions[name];
      eases['easeIn' + name] = easeIn;
      eases['easeOut' + name] = function(t, m) { return 1 - easeIn(1 - t, m); };
      eases['easeInOut' + name] = function(t, m) { return t < 0.5 ? easeIn(t * 2, m) / 2 : 1 - easeIn(t * -2 + 2, m) / 2; };
    });
    eases.linear = function(t) { return t; };
    return eases;
  })();

is.js

var is = (function() {
    return {
      array:  function(a) { return Array.isArray(a) },
      object: function(a) { return Object.prototype.toString.call(a).indexOf('Object') > -1 },
      html:   function(a) { return (a instanceof NodeList || a instanceof HTMLCollection) },
      node:   function(a) { return a.nodeType },
      svg:    function(a) { return a instanceof SVGElement },
      number: function(a) { return !isNaN(parseInt(a)) },
      string: function(a) { return typeof a === 'string' },
      func:   function(a) { return typeof a === 'function' },
      undef:  function(a) { return typeof a === 'undefined' },
      null:   function(a) { return typeof a === 'null' },
      hex:    function(a) { return /(^#[0-9A-F]{6}$)|(^#[0-9A-F]{3}$)/i.test(a) },
      rgb:    function(a) { return /^rgb/.test(a) },
      rgba:   function(a) { return /^rgba/.test(a) },
      hsl:    function(a) { return /^hsl/.test(a) },
      color:  function(a) { return (is.hex(a) || is.rgb(a) || is.rgba(a) || is.hsl(a))}
    }
  })();