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// @param {Boolean} defaults 默认不传参，为undefined，目标对象的已有属性不被覆盖；为true，则可以被覆盖
function createAssigner(defaults) {
  
  function extend(obj) {
    for (var i = 1; i < arguments.length; i++) {
      var def = arguments[i];
      for (var key in def) {
        if (!defaults || obj[key] === void 0) {
          obj[key] = def[key];
        }

black-black-cat

/*\
|*|
|*|  :: cookies.js ::
|*|
|*|  A complete cookies reader/writer framework with full unicode support.
|*|
|*|  https://developer.mozilla.org/en-US/docs/DOM/document.cookie
|*|
|*|  This framework is released under the GNU Public License, version 3 or later.
|*|  http://www.gnu.org/licenses/gpl-3.0-standalone.html

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/**
 * @param {Function} subType
 * @param {Function} superType
 */
function inheritPrototype(subType, superType) {
    // 以一个空函数作为中介，保证不把父类构造器中的属性带进原型链
    function F() {}
    // 把F的prototype指向父类的prototype，修改整个prototype而不是部分prototype
    F.prototype = superType.prototype;
    // new F()完成两件事情，1. 执行F构造函数，为空；2. 执行F的prototype的内存分配，这里就是父类，也就是Person的getAge方法

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// example 1
function a(c) {
    // 在a的作用域中声明b
    return function b(d) {
        // b中使用了a的局部变量c
        c += 1;
        return c + d;
    }
}

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/**
 * @param {String} downloadUri
 * @param {Boolean} useIFrame
 */ 
function startDownloading(downloadUri, useIFrame) { 
    if (!downloadUri || !downloadUri.length) { 
        return; 
    } 
    
    if (useIFrame === void 0) {

black-black-cat

// JS 浮点数四则运算精度丢失解决方案

// 计算小数点后面有几位
function getBits(num) {
  var eq1;
  return (eq1 = num.toString().split('.')[1]) ? eq1.length : 0;
}

// 加法
Number.prototype.add = function(arg) {

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/**
 * @param  {String} substr 用来搜索的子串
 * @param  {String} str 被搜索的字符串
 * @return {Array} 由匹配到的索引组成的数组
 */
function getIndexes(substr, str) {
    var arr = [];
    var index;
    var len = 0;
    var slicedStr = str;

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var createClass = function (Parent, props) {
    if (arguments.length === 1) {
        props = Parent;
        Parent = null;
    }

    var Child, F, i;

    // 1. 构造函数
    Child = function Klass() {

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var B = {};
B.url = {};
// 获取search 或 hash 中的参数
B.url.getParam = function(name, url) {
  url = url || location.href;
  var reg = new RegExp("(^|&|\\?|#)" + name + "=([^&]*?)(&|#|$)");
  var tempHash = url.match(/#.*/) ? url.match(/#.*/)[0] : "";
  url = url.replace(/#.*/, "");

  if (reg.test(tempHash)) {

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/**
 * 1. Original JS Implementation by Jeff Greenberg 2/2001 - http://home.earthlink.net/~kendrasg/info/js_opt/
 * 2. (fast duff's device) from an anonymous donor to Jeff Greenberg's site
 * 3. (faster duff's defice) by Andrew King 8/2002 for WebSiteOptimization.com
 * 4. bug fix (for iterations<8) by Andrew B. King April 12, 2003
 */
function duffsDevice (iterations) {
  var testVal = 0,
      n = iterations % 8;