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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;

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) {

black-black-cat

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

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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 {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

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

black-black-cat

// @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

html,body,div,span,applet,object,iframe,h1,h2,h3,h4,h5,h6,p,blockquote,pre,a,abbr,acronym,address,big,cite,code,del,dfn,em,img,ins,kbd,q,s,samp,small,strike,strong,sub,sup,tt,var,b,u,i,center,dl,dt,dd,ol,ul,li,fieldset,form,label,legend,table,caption,tbody,tfoot,thead,tr,th,td,article,aside,canvas,details,embed,figure,figcaption,footer,header,hgroup,menu,nav,output,ruby,section,summary,time,mark,audio,video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline
}

article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section {

black-black-cat

/* Based on Alex Arnell's inheritance implementation. */

/** section: Language
* class Class
*
*  Manages Prototype's class-based OOP system.
*
*  Refer to Prototype's web site for a [tutorial on classes and
*  inheritance](http://prototypejs.org/learn/class-inheritance).
**/

black-black-cat

// 先求两个的对称差，用求得的结果与其后的数组重复之前步骤
function sym() {
    var ans = [];
    var args = Array.prototype.slice.call(arguments);
    var len = args.length;
    var two;
    function uniq(arr) {
    	var output = [];
    	var objMark = {};
    	arr.forEach(function(item, index) {