+<meta name="keywords" content="Javascript, guide, open-sourced ,或,,0,,2,,3,,4,,5,,6,,7,,8,,9,,10,,11,,12,,13,,14,,15,,16,,17,,32,,53,,64,,754,,10308,,#,,ES,,特性,,概述,,比较,,新,,更多,,。,,加入,,的,,大致,,氛围,,三,,类,,：,,*,,扩展,,已,,有的,,原生,,对象,,API,,Object,,上,,新方法,,String,,Math,,.,,全新,,数据结构,,WeakMap,,Set,,语法,,表达式,,、,,糖,,等,,arrow,,function,,const,,let,,rest,,parameters,,,,,default,,spread,,call,,array,,class,,computed,,properties,,Modules,,for,,-,,of,,loop,,Array,,comprehensions,,Generator,,Iterator,,Block,,level,,Destructuring,,由于,,新的,,非常,,复杂,,，,,本篇,,只,,描述,,部分,,中,,之后,,后,,分,,篇,,目前,,已经,,成熟的,,（,,例如,,和,,）,,fromCodePoint,,(,,n,,),,从,,UTF,,代码,,转换,,字符,,这里,,笔者,,也不,,太,,清楚,,应,,该,,编码,,有关,,[,,^,,],,prototype,,codePointAt,,字符串,,取,,CodePoint,,repeat,,`,,",,abc,,/,,abcabc,,startsWith,,a,,p,,判断,,是否,,以,,开头,,；,,检索,,起始,,位置,,是,,可选,,endWith,,结尾,,contains,,包含,,子,,串,,from,,arrayLike,,map,,thisArg,,根据,,数组,,创建,,一个,,方法,,其,,上下文,,items,,给定,,参数,,find,,cb,,寻找,,通过,,指定,,函数,,测试,,第,,元素,,findIndex,,同上,,但,,返回,,索引,,号,,fill,,v,,s,,e,,在,,之间,,添,,入,,多,,个,,getOwnPropertyDescriptors,,o,,获取,,属性,,搜寻,,时,,不在,,原型,,链,,搜索,,getPropertyDescriptor,,getOwnPropertyNames,,自身,,可,,枚举,,不可枚举,,键名,,注意,,方法会,,那些,,enumerable,,设置,,为,,false,,propety,,is,,b,,检测,,两个,,值,,相同,,不会,,进行,,如同,,=,,操作,,符,,那样,,去,,数值,,与,,也,,有,,细微,,差别,,仅,,当,,符合,,下面,,任意,,条件,,才,,true,,都是,,undefined,,null,,1,,长,,内容,,同一个,,number,,并且,,满足,,以下,,任一,,+,,NaN,,都,,是非,,零,,非,,一样,,setPrototypeOf,,proto,,将,,修改,,_,,行为,,一致,,单个,,一般,,不,,被,,推荐,,assign,,target,,source,,类似,,underscore,,lodash,,extend,,合并,,到,,Number,,数字,,算数,,而且,,常用,,但是,,却,,必备,,isFinite,,有穷,,过程,,尝试,,Infinity,,;,,isInteger,,正整数,,isNaN,,强制,,转行,,确实,,isSafeInteger,,MAX,,SAFE,,INTEGER,,范围内,,说明,,一下,,NUMBER,,VALUE,,1.7976931348623157,,×,,这是,,IEE,,定义,,double,,最大值,,［,,］,,EPSILON,,常量,,代表,,大于,,最小值,,之,,差,,大约,,2.2204460492503130808472633361816,,x,,,,clz,,CountLeadingZeroes,,计算,,32位,,无,,符号,,位,,整形,,二进制,,形式,,多少,,imul,,正数,,乘法,,方式,,来,,一种,,可能,,Javascript,,实现,,{,,var,,ah,,>,,&,,xffff,,al,,bh,,bl,,the,,shift,,by,,fixes,,sign,,on,,high,,part,,final,,|,,converts,,unsigned,,value,,into,,signed,,return,,<,,},,一,,个数,,foo,,log,,lg,,ln,,expm,,cosh,,sinh,,tanh,,acosh,,asinh,,atanh,,hypot,,平方,,平均数,,trunc,,?,,ceil,,:,,floor,,fround,,最接近的,,单,,精度,,浮点,,cbrt,,求,,立方根,,关于,,及其,,他,,标准,,快速,,发展,,之中,,讨论,,扩展到,,规划,,之内,,就,,像,,W,,C,,新版,,他们,,出现,,往往,,开发者,,轻视,,前,,段,,兼容性,,实用性,,借口,,选择性,,忽略,,不知不觉,,这些,,成为,,了,,守旧,,者,,曾经,,视为,,华而不实,,Canvas,,ApplicationStorage,,Websocket,,技术,,如今,,大量,,在线,,应用,,基础设施,,中部,,广泛,,用到,,node,,开发,,也许,,不久,,未来,,nodejs,,所,,写,,浏览器,,端,,使用,,两种,,不同的,,语言,,不少,,层面,,可以,,shim,,支持,,二次,,编译,,所以,,不是,,找,,理由,,不了解,,ECMAScript,,时候,,http://stackoverflow.com/questions/3744721/javascript-strings-outside-of-the-bmp,,https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith,,https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith,,https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/contains,,http://people.mozilla.org/~jorendorff/es6-draft.html#sec-22.1.2.1,,https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find,,http://people.mozilla.org/~jorendorff/es6-draft.html#sec-22.1.3.6,,https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor,,https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is,,https://people.mozilla.org/~jorendorff/es6-draft.html#sec-number.issafeinteger,,http://en.wikipedia.org/wiki/Double-precision_floating-point_format,,http://wiki.ecmascript.org/doku.php?id=harmony:specification_drafts,,http://esdiscuss.org/topic/es6-es7-es8-and-beyond-a-proposed-roadmap,,https://github.com/paulmillr/es6-shim/,,https://github.com/addyosmani/es6-tools">
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