blocks|key|1034422|text|通过使用首选方法确保您实际上处于IE8模式，即标准文档类型...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1034423|<!DOCTYPE+html>|code-block|syntax|javascript|1034424|...or不需要的方法，X-UA-Compatible元标记/标头...|offset|length|style|CODE|1034425|<meta+http-equiv="X-UA-Compatible"+content="IE=EDGE"+/>|1034426|有关详细信息，请参阅Defining+Document+Compatibility。|1034427|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/cc288325(v=VS.85).aspx^0|0|0|C|F|0|0|A|V|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@$I|11|J|12|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|14|8|@]|9|@$I|15|J|16|1|17]]|A|$]]|$1|Q|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

Make sure you're actually in IE 8 mode by using the preferred method, a standards doctype...

<pre><code>&lt;!DOCTYPE html&gt;
</code></pre>

...or the undesired method, the <code>X-UA-Compatible</code> meta tag/header...

<pre><code>&lt;meta http-equiv="X-UA-Compatible" content="IE=EDGE" /&gt;
</code></pre>

See <a href="http://msdn.microsoft.com/en-us/library/cc288325(v=VS.85).aspx" rel="noreferrer">Defining Document Compatibility</a> for more information.

blocks|key|819534|text|如果您已经在使用JQuery，那么使用jQuery.parseJSON为我解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|819535|entityMap|0|LINK|mutability|MUTABLE|url|http://api.jquery.com/jquery.parsejson/^0|J|G|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]]]]

Using <a href="http://api.jquery.com/jquery.parsejson/" rel="noreferrer">jQuery.parseJSON</a> solved this for me, in case you are already using JQuery.

blocks|key|819431|text|如果没有doctype或doctype错误，或者html语法有一些错误，则会迫使IE使用与您期望的不同的文档模式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|819432|我在一个测试文档中使用了简单的"“，而标题标签作为HEAD标签的子级的缺失使得window.JSON变得未定义。|819433|请始终记住，最好针对浏览器的版本测试资源。而且，如果您的用户可以使用IE来模拟文档模式，那么当本机模式未定义时，最好有一段代码来提供JSON.parse和JSON.stringify。|819434|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Other things that absence of doctype or wrong doctype, or some error with html syntax, will force IE to use document modes different from what you expect.

I was using simple "" in a test document and the absence of TITLE tag as a child of HEAD tag made window.JSON become undefined.

Remember always that it's better to test the resource against the version of browser. And, if your users can use IE's with emulation of document modes, it's better you have a piece of code to provide the JSON.parse and JSON.stringify when natives are undefined.

blocks|key|819563|text|function+parseJson(jsonString)+{
++++if+($.browser.msie+&&+$.browser.version+<+8)+{
++++++++return+eval('('+%2B+jsonString+%2B+')');
++++}
++++else+{
++++++++return+JSON.parse(jsonString);
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|819564|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>function parseJson(jsonString) {
 if ($.browser.msie &amp;&amp; $.browser.version &lt; 8) {
 return eval('(' + jsonString + ')');
 }
 else {
 return JSON.parse(jsonString);
 }
}
</code></pre>

blocks|key|819461|text|如果页面编码是带有BOM+(字节顺序标记)的UTF-8，尽管使用<!DOCTYPE+html>，也可能会发生这种情况。尝试使用合适的文本编辑器，在不使用BOM的情况下将文件另存为UTF-8。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|819462|entityMap^0|9|3|M|5|W|F|24|3|2H|5|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|G|$]]

May happen despite <code>&lt;!DOCTYPE html&gt;</code> if the page encoding is <code>UTF-8</code> with <code>BOM</code> (byte order mark). Try saving the file as <code>UTF-8</code> without <code>BOM</code>, using a suitable text editor.

blocks|key|819667|text|将以下代码放入js文件中；|type|unstyled|depth|inlineStyleRanges|entityRanges|data|819668|var+JSON+=+JSON+%7C%7C+{};

//+implement+JSON.stringify+serialization
JSON.stringify+=+JSON.stringify+%7C%7C+function+(obj)+{

var+t+=+typeof+(obj);
if+(t+!=+"object"+%7C%7C+obj+===+null)+{

++++//+simple+data+type
++++if+(t+==+"string")+obj+=+'"'%2Bobj%2B'"';
++++return+String(obj);

}
else+{

++++//+recurse+array+or+object
++++var+n,+v,+json+=+[],+arr+=+(obj+&&+obj.constructor+==+Array);

++++for+(n+in+obj)+{
++++++++v+=+obj[n];+t+=+typeof(v);

++++++++if+(t+==+"string")+v+=+'"'%2Bv%2B'"';
++++++++else+if+(t+==+"object"+&&+v+!==+null)+v+=+JSON.stringify(v);

++++++++json.push((arr+?+""+:+'"'+%2B+n+%2B+'":')+%2B+String(v));
++++}

++++return+(arr+?+"["+:+"{")+%2B+String(json)+%2B+(arr+?+"]"+:+"}");
}
};

//+implement+JSON.parse+de-serialization
JSON.parse+=+JSON.parse+%7C%7C+function+(str)+{
if+(str+===+"")+str+=+'""';
eval("var+p="+%2B+str+%2B+";");
return+p;
+};|code-block|syntax|javascript|819669|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

put following code in your js file ;

<pre><code>var JSON = JSON || {};

// implement JSON.stringify serialization
JSON.stringify = JSON.stringify || function (obj) {

var t = typeof (obj);
if (t != "object" || obj === null) {

 // simple data type
 if (t == "string") obj = '"'+obj+'"';
 return String(obj);

}
else {

 // recurse array or object
 var n, v, json = [], arr = (obj &amp;&amp; obj.constructor == Array);

 for (n in obj) {
 v = obj[n]; t = typeof(v);

 if (t == "string") v = '"'+v+'"';
 else if (t == "object" &amp;&amp; v !== null) v = JSON.stringify(v);

 json.push((arr ? "" : '"' + n + '":') + String(v));
 }

 return (arr ? "[" : "{") + String(json) + (arr ? "]" : "}");
}
};

// implement JSON.parse de-serialization
JSON.parse = JSON.parse || function (str) {
if (str === "") str = '""';
eval("var p=" + str + ";");
return p;
 };
</code></pre>

blocks|key|1034712|text|检查jQuery版本。jQuery+2.0+drops+support+for+IE+6,+7+and+8。改为使用jQuery+1.x，它仍然是官方支持的。您可以使用此代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1034713|<script+src="http://code.jquery.com/jquery-1.9.0.js"></script>
<script+src="http://code.jquery.com/jquery-migrate-1.2.1.js"></script>|code-block|syntax|javascript|1034714|阅读有关jquery+migrate的更多信息。|1034715|如果不工作，请检查this+article。|1034716|entityMap|0|LINK|mutability|MUTABLE|url|http://blog.jquery.com/2013/04/18/jquery-2-0-released/|1|https://github.com/jquery/jquery-migrate/#readme|2|http://chapter31.com/2012/11/21/json-undefined-issues-on-ie8-and-ie9/^0|B|16|0|0|0|4|E|1|0|9|C|2|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|13|8|@]|9|@$A|14|B|15|1|16]]|C|$]]|$1|K|3|L|5|6|7|17|8|@]|9|@$A|18|B|19|1|1A]]|C|$]]|$1|M|3|-4|5|6|7|1B|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]|U|$5|P|Q|R|C|$S|V]]|W|$5|P|Q|R|C|$S|X]]]]

Check jQuery version.
<a href="http://blog.jquery.com/2013/04/18/jquery-2-0-released/" rel="nofollow">jQuery 2.0 drops support for IE 6, 7 and 8</a>. Use jQuery 1.x instead, which is still officially supported.
you can use this Code.

<pre><code>&lt;script src="http://code.jquery.com/jquery-1.9.0.js"&gt;&lt;/script&gt;
&lt;script src="http://code.jquery.com/jquery-migrate-1.2.1.js"&gt;&lt;/script&gt;
</code></pre>

read more about <a href="https://github.com/jquery/jquery-migrate/#readme" rel="nofollow">jquery migrate</a>.

if not working check <a href="http://chapter31.com/2012/11/21/json-undefined-issues-on-ie8-and-ie9/" rel="nofollow">this article</a>.

blocks|key|819720|text|在我的例子中，未定义的错误是因为我缺少一个JSON库。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|819721|您可以像这样添加JSON对象(用您自己的路径替换相对路径)：|819722|<script>
++++++++if+(typeof+window.JSON+==+'undefined')+{
++++++++++document.write('<script+src="../scripts/json2.js"><\/script>');+
++++++++}
</script>|code-block|syntax|javascript|819723|对于json2库：http://cdnjs.com/libraries/json2/|offset|length|819724|还有一个json3库：http://cdnjs.com/libraries/json3/|819725|然后你可以在你的代码中引用它：|819726|var+array+=+[];
array[1]+=+"apple";
array[2]+=+"orange";
alert(JSON.stringify(array));|819727|entityMap|0|LINK|mutability|MUTABLE|url|http://cdnjs.com/libraries/json2/|1|http://cdnjs.com/libraries/json3/^0|0|0|0|9|X|0|0|B|X|1|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|15|8|@]|9|@$K|16|L|17|1|18]]|A|$]]|$1|M|3|N|5|6|7|19|8|@]|9|@$K|1A|L|1B|1|1C]]|A|$]]|$1|O|3|P|5|6|7|1D|8|@]|9|@]|A|$]]|$1|Q|3|R|5|F|7|1E|8|@]|9|@]|A|$G|H]]|$1|S|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]|10|$5|V|W|X|A|$Y|11]]]]

In my case the undefined error was because I was missing a JSON library.

You can add JSON object like this (replace the relative path with your own path):

<pre><code>&lt;script&gt;
 if (typeof window.JSON == 'undefined') {
 document.write('&lt;script src="../scripts/json2.js"&gt;&lt;\/script&gt;'); 
 }
&lt;/script&gt;
</code></pre>

For json2 library:
<a href="http://cdnjs.com/libraries/json2/" rel="nofollow">http://cdnjs.com/libraries/json2/</a>

There is also a json3 library:
<a href="http://cdnjs.com/libraries/json3/" rel="nofollow">http://cdnjs.com/libraries/json3/</a>

Then you can refer to it in your code:

<pre><code>var array = [];
array[1] = "apple";
array[2] = "orange";
alert(JSON.stringify(array));
</code></pre>

Currently I'm writing a JavaScript file and have the following line:

<pre><code>var res = "JSON=" + JSON.stringify(result);
</code></pre>

result is being set just above this line. The issue I'm having is that IE8 (IE8 only, that is) is reporting to me that JSON is undefined somehow. I'm not sure what to make of this since, as I understood it, IE8 is a browser that implemented JSON support. Does anyone have any idea what might be going on?

JSON object undefined in Internet Explorer 8

jQuery

JSON

目前，我正在编写一个JavaScript文件，其中包含以下代码行：var res = "JSON=" + JSON.stringify(result);结果被设置在这条线的正上方。我遇到的问题是，IE8 (仅限IE8)向我报告JSON以某种方式未定义。我不知道该如何理解这一点，因为据我所知，IE8是一个实现了JSON支持的浏览器。有谁知道可能发生了什么吗？

问Internet Explorer 8中未定义的JSON对象
EN

回答 8

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问Internet Explorer 8中未定义的JSON对象EN

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问Internet Explorer 8中未定义的JSON对象
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