One data format that makes AJAX more effective is JSON.
Here's what it might look like:
Suppose we already have a function AJAX that uses the XMLHttp object to make an AJAX request to the specified page sending any data and then calling a callback function, passing it the server's response.
If the response text is encoded in JSON, we can simply make it into an object using the eval function:
Because it is so popular, many other programming languages have native functions to encode and decode JSON. PHP, for instance, has the json_encode and json_decode functions, which will return a string with the JSON equivalent of a passed object, and vice versa.
Be careful when applying the eval function to a string of unknown or untrusted origin. Hackers may try to inject malicious code into your page, and this is a massive security breach. I personally never use this function unless I wrote the script myself.
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