blocks|key|1355828|text|所谓“不实现关键功能”实际上是指“符合ECMA+262第三版”，对吗？:)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1355829|您所指的方法是新的第5‘版本的一部分-对于不支持该版本的浏览器，您可以使用下面的“shim”将第3'rd扩展到第5’http://github.com/kriskowal/narwhal-lib/blob/narwhal-lib/lib/global-es5.js。|offset|length|1355830|entityMap|0|LINK|mutability|MUTABLE|url|http://github.com/kriskowal/narwhal-lib/blob/narwhal-lib/lib/global-es5.js^0|0|1M|22|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

By 'not implement key functions' you actually means 'conforms to the ECMA 262 3'rd ed' right? :)

The methods you are referring to are part of the new 5'th edition - for browsers not supporting this you can use the following 'shim' that extends 3'rd into 5'th
<a href="http://github.com/kriskowal/narwhal-lib/blob/narwhal-lib/lib/global-es5.js" rel="nofollow noreferrer">http://github.com/kriskowal/narwhal-lib/blob/narwhal-lib/lib/global-es5.js</a>.

blocks|key|1653530|text|许多人使用MDC后备实现(例如。(+indexOf)。它们通常符合严格的标准，甚至可以显式检查所有参数的类型。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1653531|不幸的是，虽然很明显，作者认为这段代码是琐碎的和可自由使用的，但似乎没有明确的许可将其写成书面形式。wiki作为一个整体是CC属性-ShareAlike，如果这是一个可接受的许可(尽管CC不是为代码本身设计的)。|1653532|一般情况下，js-方法看起来没问题，但是在函数应该是什么样的边缘时，它并不是标准兼容的(例如。未定义的列表项、更改列表的函数)。它也充满了其他随机的非标准方法，包括一些可疑的方法，如不可靠的stripTags和不完整的UTF-8编解码器(考虑到unescape(encodeURIComponent)技巧，这也有点不必要)。|style|CODE|1653533|至于它的价值，这里是我使用的(我在此发布到公共领域，如果可以说它是版权的)。它比MDC版本略短一些，因为它不试图键入嗅探您没有做过一些愚蠢的事情，比如pass非函数回调或非整数索引，但除此之外，它还试图符合标准。(如果我漏掉了什么，请告诉我。；-)|1653534|'use+strict';

//+Add+ECMA262-5+method+binding+if+not+supported+natively
//
if+(!('bind'+in+Function.prototype))+{
++++Function.prototype.bind=+function(owner)+{
++++++++var+that=+this;
++++++++if+(arguments.length<=1)+{
++++++++++++return+function()+{
++++++++++++++++return+that.apply(owner,+arguments);
++++++++++++};
++++++++}+else+{
++++++++++++var+args=+Array.prototype.slice.call(arguments,+1);
++++++++++++return+function()+{
++++++++++++++++return+that.apply(owner,+arguments.length===0?+args+:+args.concat(Array.prototype.slice.call(arguments)));
++++++++++++};
++++++++}
++++};
}

//+Add+ECMA262-5+string+trim+if+not+supported+natively
//
if+(!('trim'+in+String.prototype))+{
++++String.prototype.trim=+function()+{
++++++++return+this.replace(/%5E\s%2B/,+'').replace(/\s%2B$/,+'');
++++};
}

//+Add+ECMA262-5+Array+methods+if+not+supported+natively
//
if+(!('indexOf'+in+Array.prototype))+{
++++Array.prototype.indexOf=+function(find,+i+/*opt*/)+{
++++++++if+(i===undefined)+i=+0;
++++++++if+(i<0)+i%2B=+this.length;
++++++++if+(i<0)+i=+0;
++++++++for+(var+n=+this.length;+i<n;+i%2B%2B)
++++++++++++if+(i+in+this+&&+this[i]===find)
++++++++++++++++return+i;
++++++++return+-1;
++++};
}
if+(!('lastIndexOf'+in+Array.prototype))+{
++++Array.prototype.lastIndexOf=+function(find,+i+/*opt*/)+{
++++++++if+(i===undefined)+i=+this.length-1;
++++++++if+(i<0)+i%2B=+this.length;
++++++++if+(i>this.length-1)+i=+this.length-1;
++++++++for+(i%2B%2B;+i-->0;)+/*+i%2B%2B+because+from-argument+is+sadly+inclusive+*/
++++++++++++if+(i+in+this+&&+this[i]===find)
++++++++++++++++return+i;
++++++++return+-1;
++++};
}
if+(!('forEach'+in+Array.prototype))+{
++++Array.prototype.forEach=+function(action,+that+/*opt*/)+{
++++++++for+(var+i=+0,+n=+this.length;+i<n;+i%2B%2B)
++++++++++++if+(i+in+this)
++++++++++++++++action.call(that,+this[i],+i,+this);
++++};
}
if+(!('map'+in+Array.prototype))+{
++++Array.prototype.map=+function(mapper,+that+/*opt*/)+{
++++++++var+other=+new+Array(this.length);
++++++++for+(var+i=+0,+n=+this.length;+i<n;+i%2B%2B)
++++++++++++if+(i+in+this)
++++++++++++++++other[i]=+mapper.call(that,+this[i],+i,+this);
++++++++return+other;
++++};
}
if+(!('filter'+in+Array.prototype))+{
++++Array.prototype.filter=+function(filter,+that+/*opt*/)+{
++++++++var+other=+[],+v;
++++++++for+(var+i=0,+n=+this.length;+i<n;+i%2B%2B)
++++++++++++if+(i+in+this+&&+filter.call(that,+v=+this[i],+i,+this))
++++++++++++++++other.push(v);
++++++++return+other;
++++};
}
if+(!('every'+in+Array.prototype))+{
++++Array.prototype.every=+function(tester,+that+/*opt*/)+{
++++++++for+(var+i=+0,+n=+this.length;+i<n;+i%2B%2B)
++++++++++++if+(i+in+this+&&+!tester.call(that,+this[i],+i,+this))
++++++++++++++++return+false;
++++++++return+true;
++++};
}
if+(!('some'+in+Array.prototype))+{
++++Array.prototype.some=+function(tester,+that+/*opt*/)+{
++++++++for+(var+i=+0,+n=+this.length;+i<n;+i%2B%2B)
++++++++++++if+(i+in+this+&&+tester.call(that,+this[i],+i,+this))
++++++++++++++++return+true;
++++++++return+false;
++++};
}|code-block|syntax|javascript|1653535|这里没有实现的其他ECMA262-5方法包括数组reduce/reduceRight、JSON方法和少数几个可以作为JS函数可靠实现的新Object方法。|1653536|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/En/Core_JavaScript_1.5_Reference/Objects/Array/IndexOf^0|I|7|0|0|0|3E|S|0|0|0|O|6|V|B|1W|6|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|D|3|E|5|6|7|14|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|15|8|@$A|16|B|17|H|I]]|9|@]|C|$]]|$1|J|3|K|5|6|7|18|8|@]|9|@]|C|$]]|$1|L|3|M|5|N|7|19|8|@]|9|@]|C|$O|P]]|$1|Q|3|R|5|6|7|1A|8|@$A|1B|B|1C|H|I]|$A|1D|B|1E|H|I]|$A|1F|B|1G|H|I]]|9|@]|C|$]]|$1|S|3|-4|5|6|7|1H|8|@]|9|@]|C|$]]]|T|$U|$5|V|W|X|C|$Y|Z]]]]

Many use the MDC fallback implementations (eg. for <a href="https://developer.mozilla.org/En/Core_JavaScript_1.5_Reference/Objects/Array/IndexOf" rel="noreferrer">indexOf</a>). They're generally rigorously standards-compliant, even to the extent of explicitly checking the types of all the arguments.

Unfortunately whilst it is clear that the authors regard this code as trivial and freely-usable, there doesn't seem to be an explicit licence-grant to put this in writing. The wiki as a whole is CC Attribution-ShareAlike, if that's an acceptable licence (though CC isn't designed for code as such).

js-methods looks OK in general, but is not as standards-compliant around the edges of how the functions are supposed to be (eg. undefined list items, functions that mutate the list). It's also full of other random non-standard methods, including some questionable ones like the dodgy stripTags and the incomplete UTF-8 codec (which is also a bit unnecessary given the <code>unescape(encodeURIComponent)</code> trick).

For what it's worth, here's what I use (which I hereby release into the public domain, if it can be said to be copyrightable at all). It's a bit shorter than the MDC versions as it doesn't attempt to type-sniff that you haven't done something silly like pass non-function callbacks or non-integer indexes, but apart from that it attempts to be standards-compliant. (Let me know if I've missed anything. ;-))

<pre><code>'use strict';

// Add ECMA262-5 method binding if not supported natively
//
if (!('bind' in Function.prototype)) {
 Function.prototype.bind= function(owner) {
 var that= this;
 if (arguments.length&lt;=1) {
 return function() {
 return that.apply(owner, arguments);
 };
 } else {
 var args= Array.prototype.slice.call(arguments, 1);
 return function() {
 return that.apply(owner, arguments.length===0? args : args.concat(Array.prototype.slice.call(arguments)));
 };
 }
 };
}

// Add ECMA262-5 string trim if not supported natively
//
if (!('trim' in String.prototype)) {
 String.prototype.trim= function() {
 return this.replace(/^\s+/, '').replace(/\s+$/, '');
 };
}

// Add ECMA262-5 Array methods if not supported natively
//
if (!('indexOf' in Array.prototype)) {
 Array.prototype.indexOf= function(find, i /*opt*/) {
 if (i===undefined) i= 0;
 if (i&lt;0) i+= this.length;
 if (i&lt;0) i= 0;
 for (var n= this.length; i&lt;n; i++)
 if (i in this &amp;&amp; this[i]===find)
 return i;
 return -1;
 };
}
if (!('lastIndexOf' in Array.prototype)) {
 Array.prototype.lastIndexOf= function(find, i /*opt*/) {
 if (i===undefined) i= this.length-1;
 if (i&lt;0) i+= this.length;
 if (i&gt;this.length-1) i= this.length-1;
 for (i++; i--&gt;0;) /* i++ because from-argument is sadly inclusive */
 if (i in this &amp;&amp; this[i]===find)
 return i;
 return -1;
 };
}
if (!('forEach' in Array.prototype)) {
 Array.prototype.forEach= function(action, that /*opt*/) {
 for (var i= 0, n= this.length; i&lt;n; i++)
 if (i in this)
 action.call(that, this[i], i, this);
 };
}
if (!('map' in Array.prototype)) {
 Array.prototype.map= function(mapper, that /*opt*/) {
 var other= new Array(this.length);
 for (var i= 0, n= this.length; i&lt;n; i++)
 if (i in this)
 other[i]= mapper.call(that, this[i], i, this);
 return other;
 };
}
if (!('filter' in Array.prototype)) {
 Array.prototype.filter= function(filter, that /*opt*/) {
 var other= [], v;
 for (var i=0, n= this.length; i&lt;n; i++)
 if (i in this &amp;&amp; filter.call(that, v= this[i], i, this))
 other.push(v);
 return other;
 };
}
if (!('every' in Array.prototype)) {
 Array.prototype.every= function(tester, that /*opt*/) {
 for (var i= 0, n= this.length; i&lt;n; i++)
 if (i in this &amp;&amp; !tester.call(that, this[i], i, this))
 return false;
 return true;
 };
}
if (!('some' in Array.prototype)) {
 Array.prototype.some= function(tester, that /*opt*/) {
 for (var i= 0, n= this.length; i&lt;n; i++)
 if (i in this &amp;&amp; tester.call(that, this[i], i, this))
 return true;
 return false;
 };
}
</code></pre>

Other ECMA262-5 methods not implemented here include Array <code>reduce</code>/<code>reduceRight</code>, the JSON ones and the few new <code>Object</code> methods that can be reliably implemented as JS functions.

blocks|key|1355851|text|看看Underscore.js。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1355852|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/Underscore.js^0|2|D|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Take a look at <a href="https://en.wikipedia.org/wiki/Underscore.js" rel="nofollow noreferrer">Underscore.js</a>.

blocks|key|103268|text|克里斯·科瓦尔已经编译了一个小型库，它充当浏览器实现中可能缺少的ECMAScript+5函数的垫片。一些功能已经被其他人多次修改，以优化速度，并解决浏览器错误。这些函数是为了尽可能地遵循规范而编写的。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|103269|es5-shim.js是在麻省理工学院的许可下发布的，Array.prototype扩展接近顶部，您可以分割和删除任何您不需要的函数。我还建议您缩小脚本，因为注释使它比需要的要大得多。|103270|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/users/42586/kris-kowal|1|https://github.com/kriskowal/es5-shim/blob/master/es5-shim.js^0|0|7|0|0|0|B|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

<a href="https://stackoverflow.com/users/42586/kris-kowal">Kris Kowal</a> has compiled a small library that acts as a shim for ECMAScript 5 functions that may be missing from the browser's implementation. Some of the functions have been revised numerous times by other people to be optimized for speed and to work around browser bugs. The functions are written to follow the specification as closely as possible.

<a href="https://github.com/kriskowal/es5-shim/blob/master/es5-shim.js" rel="nofollow noreferrer">es5-shim.js</a> was released under the MIT license, the Array.prototype extensions are near the top and you can chop and remove any functions you don't need quite easily. I also suggest you minify the script as the comments make it much larger than it needs to be.

blocks|key|1653623|text|那些脚本在我的测试中不能很好地工作。我创建一个基于https://developer.mozilla.org/en-US/文档的具有相同函数的文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1653624|太多的问题是在Internet+8中解决的。参见中的代码。|1653625|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/^0|P|10|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

Those scripts don't work well in my tests. I create a file with the same functions based on <a href="https://developer.mozilla.org/en-US/" rel="nofollow">MDN</a> documents.

Too many problems areas are solved in Internet&nbsp;Explorer&nbsp;8. See the code in <a href="https://gist.github.com/egermano/7667171" rel="nofollow"> egermano / ie-fix.js</a>.

blocks|key|1653641|text|与Underscore.js|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1653642|var+arr=['a','a1','b']++_.filter(arr,+function(a){+return+a.indexOf('a')+>+-1;+})|offset|length|style|CODE|1653643|entityMap^0|0|0|29|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

With the Underscore.js 

<code>var arr=['a','a1','b'] 
_.filter(arr, function(a){ return a.indexOf('a') &gt; -1; })</code>

As detailed <a href="https://stackoverflow.com/questions/1744310">elsewhere</a>, and otherwise apparently well-known, Internet Explorer (definitely version 7, and in some instances, version 8) do not implement key functions, in particular on <code>Array</code> (such as <code>forEach</code>, <code>indexOf</code>, etc).

There are a number of workarounds here and there, but I'd like to fold a proper, canonical set of implementations into our site rather than copy and paste or hack away at our own implementations. I've found <a href="http://code.google.com/p/js-methods/" rel="nofollow noreferrer">js-methods</a>, which looks promising, but thought I'd post here to see whether another library comes more highly-recommended. A couple of miscellaneous criteria:

<ul>
<li>The library should just be a no-operation for those functions that a browser already has implementations for (<code>js-methods</code> appears to do quite well here).</li>
<li>Non-<a href="http://en.wikipedia.org/wiki/GNU_General_Public_License" rel="nofollow noreferrer">GPL</a>, please, though <a href="http://en.wikipedia.org/wiki/GNU_Lesser_General_Public_License" rel="nofollow noreferrer">LGPL</a> is acceptable.</li>
</ul>

Fixing JavaScript Array functions in Internet Explorer (indexOf, forEach, etc.)

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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正如详细的和其他显然众所周知的，Internet (绝对是版本7，在某些情况下，版本8)没有实现关键功能，特别是在Array上(如forEach、indexOf等)。这里和那里有许多解决办法，但我希望将一组正确的规范实现折叠到我们的站点中，而不是复制、粘贴或攻击我们自己的实现。我已经找到了，它看上去很有希望，但我想在这...

问修复Internet中的JavaScript数组函数(indexOf、forEach等)
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问修复Internet中的JavaScript数组函数(indexOf、forEach等)EN