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Not recommended in jQuery 1.3. Browser kernel ID. According to navigator.userAgent judgment. Available values: safari,opera,msie,Mozilla.

jQuery provides a set of properties, and you are free to add your own properties. Many of these attributes are very low-level, so it's hard to say whether they will remain effective in the ever-changing development.

The contents of the sequence table are strings for Ajax requests.

Set the default address of the AJAX request to "/xmlhttp/", disable global AJAX events, and use POST instead of the default GET method.

The function is executed when the AJAX request succeeds. The XMLHttpRequest object and settings are passed as parameters to the callback function.

The function is executed at the end of the AJAX request. Ajax event.

The function is executed at the beginning of the AJAX request. Ajax event.

The AJAX request executes the function before it is sent. The XMLHttpRequest object and settings are passed as parameters to the callback function.

The function is executed when an AJAX request error occurs. The XMLHttpRequest object and settings are passed as parameters to the callback function.

The function is executed when the AJAX request completes. Ajax event. The XMLHttpRequest object and settings are passed as parameters to the callback function.