JQuery 1.9 removed the $. browser alternative, jquery. browser.

JQuery 1.9 removed the $. browser alternative, jquery. browser.

$. Browser uses regular expressions to match userAgent to determine the browser version and type. jquery has been declared in the jquery1.3.2 document. browser and jquery. browser. we recommend that you discard the version. You can use jquery. support.

JQuery removed $. browser and $. browser. version from version 1.9 and replaced it with $. support. In the latest version 2.0, IE 6/7/8 is no longer supported. Later, if you need to support IE 6/7/8, you can only use jQuery 1.9 or jQuery 1.10.1. To fully support IE and mix jQuery 1.9 and 2.0, the official solution is:

<! -- [If lt IE 9]>
<Script src = 'HTTP: // keleyi.com/keleyi/pmedia/jquery-1.10.1.min.js'> </script>
<! [Endif] -->
<! -- [If gte IE 9]>
<Script src = 'HTTP: // keleyi.com/keleyi/pmedia/jquery-2.0.2.min.js'> </script>
<! [Endif] -->


For a long time, this will facilitate processing separately based on browser features in complex cases, rather than simply detecting browser types and versions. However, at present, many old programs cannot be transplanted directly to support the features of the browser, so I have found some solutions that can be replaced directly on the Internet.


Determine the browser type:

$. Browser. mozilla =/firefox/. test (navigator. userAgent. toLowerCase ());
$. Browser. webkit =/webkit/. test (navigator. userAgent. toLowerCase ());
$. Browser. opera =/opera/. test (navigator. userAgent. toLowerCase ());
$. Browser. msie =/msie/. test (navigator. userAgent. toLowerCase ());

The expression after the equal sign returns true/false, which can be directly used to replace the original $. browser. msie.


Check whether IE6 is used:
// Old
If ($. browser. msie & 7> $. browser. version ){}
// New
If ('undefined' = typeof (document. body. style. maxHeight )){}


Check whether it is IE 6-8:
If (! $. Support. leadingWhitespace ){}

We do not recommend that you use the browser type or version to determine the version.

JQuery 19 does not support $ browser to determine the browser type and version.

JQuery removed $. browser and $. browser. version from version 1.9 and replaced it with $. support. In the latest version 2.0, IE 6/7/8 is no longer supported. Later, if you need to support IE 6/7/8, you can only use jQuery 1.9. To fully support IE and mix jQuery 1.9 and 2.0, the official Solution
JQuery removed $. browser and $. browser. version from version 1.9 and replaced it with $. support. In the latest version 2.0, IE 6/7/8 is no longer supported. Later, if you need to support IE 6/7/8, you can only use jQuery 1.9. To fully support IE and mix jQuery 1.9 and 2.0, the official solution is:
<! -- [If lt IE 9]
<Script src = 'jquery-1.9.0.js' </script
<! [Endif] --
<! -- [If gte IE 9]
<Script src = 'jquery-2.0.0.js '</script
<! [Endif] -- for a long time, the zero point technology is conducive to processing browser features separately in complex cases, rather than simply detecting browser types and versions. However, at present, many old programs cannot be transplanted directly to support the features of the browser, so I have found some solutions that can be replaced directly on the Internet.
Determine the browser type:
Content from qishi Technology
$. Browser. mozilla =/firefox/. test (navigator. userAgent. toLowerCase ());
$. Browser. webkit =/webkit/. test (navigator. userAgent. toLowerCase ());
$. Browser. opera =/opera/. test (navigator. userAgent. toLowerCase ());
$. Browser. msie =/msie/. test (navigator. userAgent. toLowerCase ());
The expression after the equal sign returns true/false, which can be directly used to replace the original $. browser. msie.
Check whether it is IE6 // Oldif ($. browser. msie & 7 $. browser. version) {} // Newif ('undefined' = typeof (document. body. style. maxHeight )){}
Check whether it is IE 6-8
If (! $. Support. leadingWhitespace ){}

Q: Why does the browser prompt $ browser undefined after the jquery file is introduced (at the beginning?

I think it has something to do with your jQuery version.
JQuery removed $. browser and $. browser. version from version 1.9 and replaced it with $. support. In the latest version 2.0, IE 6/7/8 is no longer supported. Later, if you need to support IE 6/7/8, you can only use jQuery 1.9. To fully support IE and mix jQuery 1.9 and 2.0, the official Solution
JQuery removed $. browser and $. browser. version from version 1.9 and replaced it with $. support. In the latest version 2.0, IE 6/7/8 is no longer supported.