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function getThirdResoure() {
  var resp = null;
  var tags = document.querySelectorAll('iframe[src],frame[src],script[src],link[rel=stylesheet],object[data],embed[src]');
  for(var i = 0; i < tags.length; i++){
    var tag = tags[i];
    var a = document.createElement('a');
    a.href = tag.src||tag.href||tag.data;
    if(a.hostname != location.hostname){
      resp = resp || [];
      resp.push({name: tag.localName, href: a.href});

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let CHARS = 'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz0123456789-_.~!*()'; // except \'
function decToRadixN(radixChars, numLen) {
  let result = [];
  let radix = radixChars.length;
  return function cacl(dec) {
    result.unshift(dec % radix);
    if (dec >= radix) {
      dec = Math.floor(dec / radix);
      return cacl(dec, radix);
    }

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    // 返回字符串的实际长度, 一个汉字算2个长度   
    String.prototype.strlen = function () {  
        return this.replace(/[^\x00-\xff]/g, "**").length;  
    }  

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// ~符号用在JavaScript中有按位取反的作用，~~即是取反两次，而位运算的操作值要求是整数，其结果也是整数，所以经过位运算的都会自动变成整数，可以巧妙的去掉小数部分，类似于parseInt，比如：

let a = 1.23;
let b = -1.23;

console.log(~~a); // 1
console.log(~~b); // -1

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Function.prototype.before = function(beforefn){
	var _self = this;  //保存原函数的引用
	return function() {  //返回包含了原函数和新函数的 ‘代理’函数
		beforefn.apply(this, arguments);  //执行新函数，修正this，新函数在原函数之前执行
		return _self.apply(this, arguments); //执行原函数，并保证this不会被劫持
	}
}

Function.prototype.after = function(afterfn) {
	var _self = this;

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// reduce方法
let arr = [1, 2, 3, 4, 5, 6];
let reduceResult = arr.reduce((x, y) => {
  return x + y
}, 123);
console.log(reduceResult);

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Array.prototype.unique = function() { //查找索引 indexOf
  var ret = []
  for (var i = 0; i < this.length; i++) {
    if (ret.indexOf(this[i]) == -1) {
      ret.push(this[i])
    }
  }
  return ret;
}
Array.prototype.unique = function() { //借用对象

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const privateProps = new WeakMap();
function _convertToLowercase(val) {
    return val.toLowerCase();
}
class Person {
  constructor(name) {
    privateProps.set(this, {name: name});
  }
  getName() {
    return _convertToLowercase(privateProps.get(this).name);

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var versions= [{"version":"1.3.0-beta.2"},{"version":"1.3.0-beta.19"},{"version":"1.3.0-beta.18"},{"version":"1.3.0-beta.17"},{"version":"1.3.0-beta.16"},{"version":"1.3.0-beta.15"},{"version":"1.3.0-beta.14"},{"version":"1.3.0-beta.13"},{"version":"1.3.0-beta.12"},{"version":"1.3.0-beta.11"},{"version":"1.3.0-beta.10"},{"version":"1.3.0-beta.1"},{"version":"1.3.0"},{"version":"1.2.9"},{"version":"1.2.8"},{"version":"1.2.7"},{"version":"1.2.6"},{"version":"1.2.5"},{"version":"1.2.4"},{"version":"1.2.30"},{"version":"1.2.3"},{"version":"1.2.29"},{"version":"1.2.28"},{"version":"1.2.27"},{"version":"1.2.26"},{"version":"1.2.25"},{"version":"1.2.24"},{"version":"1.2.23"},{"version":"1.2.22"},{"version":"1.2.21"},{"version":"1.2.20"},{"version":"1.2.2"},{"version":"1.2.19"},{"version":"1.2.18"},{"version":"1.2.17"},{"version":"1.2.16"},{"version":"1.2.15"},{"version":"1.2.14"},{"version":"1.2.13"},{"version":"1.2.12"},{"version":"1.2.11"},{"version":"1.2.10"},{"version":"1.2.1"},{"version":"1.2.0rc3"},{"version":

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    function chainable(fn) {
      console.info('a', this);//window
      return function () {
        console.info('b1', this);
        fn.apply(this, arguments);
        console.info('b2', this);
        return this;
      };
    }