blocks|key|4687664|text|Content-Type头只用作您的应用程序的信息。浏览器并不关心它是什么。浏览器只返回AJAX调用的数据。如果希望将其解析为JSON，则需要自己完成。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4687665|头部在那里，这样你的应用程序就可以检测返回了什么数据，以及它应该如何处理这些数据。您需要查看标头，如果它是application/json，则将其解析为JSON。|4687666|这实际上就是jQuery的工作原理。如果您不告诉它如何处理结果，它将使用Content-Type来检测如何处理结果。|4687667|entityMap^0|0|C|0|1H|G|0|10|C|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|K|$]]

The <code>Content-Type</code> header is just used as info for your application. The browser doesn't care what it is. The browser just returns you the data from the AJAX call. If you want to parse it as JSON, you need to do that on your own.

The header is there so your app can detect what data was returned and how it should handle it. You need to look at the header, and if it's <code>application/json</code> then parse it as JSON.

This is actually how jQuery works. If you don't tell it what to do with the result, it uses the <code>Content-Type</code> to detect what to do with it.

blocks|key|4687714|text|Content-Type:+application/json只是内容头文件。content头部只是关于返回数据的类型的信息，例如:JSON、image(png、jpg等)、html。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4687715|请记住，JavaScript中JSON是一个数组或对象。如果您想查看所有数据，请使用console.log而不是alert：|4687716|alert(response.text);+//+Will+alert+"[object+Object]"+string
console.log(response.text);+//+Will+log+all+data+objects|code-block|syntax|javascript|4687717|如果您想以字符串形式警告原始JSON内容，则添加单引号(')：|4687718|echo+"'"+.+json_encode(array('text'+=>+'omrele'))+.+"'";
//+alert(response.text)+will+alert+{"text":"omrele"}|4687719|不要使用双引号。它会混淆JavaScript，因为JSON在每个值和键上使用双引号：|4687720|echo+'<script>var+returndata=';
echo+'"'+.+json_encode(array('text'+=>+'omrele'))+.+'"';
echo+';</script>';

//+It+will+return+the+wrong+JavaScript+code:
<script>var+returndata="{"text":"omrele"}";</script>|4687721|entityMap^0|0|U|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|11|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|12|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|13|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|14|8|@]|D|@]|E|$K|L]]|$1|U|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|V|$]]

<code>Content-Type: application/json</code> is just the content header. The content header is just information about the type of returned data, ex::JSON,image(png,jpg,etc..),html.

Keep in mind, that JSON in JavaScript is an array or object. If you want to see all the data, use console.log instead of alert:

<pre><code>alert(response.text); // Will alert "[object Object]" string
console.log(response.text); // Will log all data objects
</code></pre>

If you want to alert the original JSON content as a string, then add single quotation marks ('):

<pre><code>echo "'" . json_encode(array('text' =&gt; 'omrele')) . "'";
// alert(response.text) will alert {"text":"omrele"}
</code></pre>

Do not use double quotes. It will confuse JavaScript, because JSON uses double quotes on each value and key:

<pre><code>echo '&lt;script&gt;var returndata=';
echo '"' . json_encode(array('text' =&gt; 'omrele')) . '"';
echo ';&lt;/script&gt;';

// It will return the wrong JavaScript code:
&lt;script&gt;var returndata="{"text":"omrele"}";&lt;/script&gt;
</code></pre>

blocks|key|181742|text|最近遇到了一个问题，当响应头将content-type标记为'text/html‘时，Chrome扩展会破坏JSON流。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|181743|显然，在浏览器处理内容之前，扩展可以并将使用响应头来更改内容。|181744|更改内容类型解决了此问题。|181745|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|$]]

Recently ran into a problem with this and a Chrome extension that was corrupting a JSON stream when the response header labeled the content-type as 'text/html'.
Apparently extensions can and will use the response header to alter the content before the browser processes it.
Changing the content-type fixed the issue.

blocks|key|181765|text|这是旧的，但对于我的PHP8来说，如果字符集是set+example，它就可以工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|181766|header('Content-Type:+application/json;+charset=utf-8');
echo+json_encode(array('text'+=>+'eggs'));|code-block|syntax|javascript|181767|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|$]]

This is old but for me PHP8 it works if the charset is set example.
<pre><code>header('Content-Type: application/json; charset=utf-8');
echo json_encode(array('text' =&gt; 'eggs'));
</code></pre>

I have always been trying to avoid using most of the HTTP protocol's properties for the sake of fear of the unknown.

However, I said to myself that I'm going to face fear today and start using headers purposefully. I have been trying to send <code>json</code> data to the browser and use it right away. For example, if I have an Ajax handler function on ready state 4 which looks like so:

<pre><code>function ajaxHandler(response){
 alert(response.text);
}
</code></pre>

And I have set the content-type header in my PHP code:

<pre><code>header('Content-Type: application/json');
echo json_encode(array('text' =&gt; 'omrele'));
</code></pre>

Why can't I directly access the property from the handler function, when the browser is clearly told that the incoming data is <code>application/json</code>?

HTTP Content-Type Header and JSON

jQuery

JSON

出于对未知的恐惧，我一直试图避免使用HTTP协议的大多数属性。然而，我对自己说，今天我要面对恐惧，开始有目的地使用头文件。我一直在尝试将json数据发送到浏览器并立即使用它。例如，如果我在就绪状态4上有一个Ajax处理函数，如下所示：function ajaxHandler(response){    alert(re...

问HTTP内容类型标头和JSON
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