JQuery $. support gets the browser name and version information

In jQuery, use $. the browser object can obtain the name and version of the browser, for example, $. browser. chrome is true, indicating the current Chrome browser, $. browser. mozilla is true, indicating that the Firefox browser is currently available. You can also use $. browser. to obtain the browser version information.

The code is as follows:

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<Div id = "divtest"> <Div class = "title"> <Span class = "fl"> Get the browser name and version number </span> </Div> <Div class = "content"> </div> </Div>         <Script type = "text/javascript"> $ (Function (){ Var strTmp = "your browser name is :"; If ($. browser. chrome) {// Google chrome StrTmp + = "Chrome ";                } If ($. browser. mozilla) {// Firefox related browsers StrTmp + = "Mozilla FireFox ";                } StrTmp + = "<br/> the version number is:" // get the version number + ?; $ (". Content" pai.html (strTmp ); }); </Script>

Check whether the object is empty
 
In jQuery, you can call $. the tool function of isEmptyObject checks whether the content of an object is null. If it is null, the function returns true. Otherwise, the system returns false. The Call format is as follows:

$. IsEmptyObject (obj );

The obj parameter indicates the name of the object to be detected.
 

The code is as follows:

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<Div id = "divtest"> <Div class = "title"> <Span class = "fl"> Check whether the object is empty </span> </Div> <Div class = "content"> </div> </Div>        <Script type = "text/javascript"> $ (Function (){ Var obj = {"name": "Local tyrants "}; Var strTmp = "You have defined one :"; If ($. isEmptyObject (obj) {// check whether it is empty StrTmp + = "empty object ";               } Else { StrTmp + = "non-empty object ";               } $ (". Content" pai.html (strTmp ); }); </Script>

 
Check whether the object is the original object

The call name is $. the tool function of isPlainObject can detect whether the Object is an original Object created using the {} or new Object () keyword. If yes, true is returned. Otherwise, false is returned. The Call format is:
$. IsPlainObject (obj );
The obj parameter indicates the name of the object to be detected.

JQuery has removed $. browser and $. browser. version from version 1.9 and replaced it with the $. support method. For more information about $. support, see:

JQuery 1.9 replaces $. support with the $. browser method.

Use $. support to determine the browser! Test the following code:

The code is as follows:

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Alert ($. support. opacity + "" + $. support. style + "" + window. XMLHttpRequest ); Ie6: false undefind Ie7: false object Ie8: false true object Ie9: true object SO, judge the browser: alert ($. support. opacity + "" + $. support. style + "" + window. XMLHttpRequest ); Var isIE6 =! $. Support. opacity &&! $. Support. style & window. XMLHttpRequest = undefined; Var isIE7 =! $. Support. opacity &&! $. Support. style & window. window. XMLHttpRequest! = Undefined; Var isIE67 =! $. Support. opacity &&! $. Support. style; // ie6 \ 7 If you want to check ie, simply use var isIE =/msie/. test (navigator. userAgent. toLowerCase ());

Of course, you can also use pure js to detect

The code is as follows:

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Function isBrowser (){ Var Sys = {}; Var ua = navigator. userAgent. toLowerCase (); Var s; (S = ua. match (/msie ([\ d.] + )/))? Sys. ie = s [1]: (S = ua. match (/firefox \/([\ d.] + )/))? Sys. firefox = s [1]: (S = ua. match (/chrome \/([\ d.] + )/))? Sys. chrome = s [1]: (S = ua. match (/opera. ([\ d.] + )/))? Sys. opera = s [1]: (S = ua. match (/version \/([\ d.] +). * safari /))? Sys. safari = s [1]: 0; If (Sys. ie) {// Js judge as ie browser Alert ('http: // www.111cn.net '+ Sys. ie ); If (Sys. ie = '9. 0') {// Js determines it is IE 9 } Else if (Sys. ie = '8. 0') {// Js determines it as IE 8 } Else {         }     } If (Sys. firefox) {// Js judge as firefox Alert ('http: // www.111cn.net '+ Sys. firefox );     } If (Sys. chrome) {// Js judge as Google chrome Alert ('http: // www.111cn.net '+ Sys. chrome );     } If (Sys. opera) {// Js judge as operabrowser Alert ('http: // www.111cn.net '+ Sys. opera );     } If (Sys. safari) {// Js determines it is an Apple safari browser Alert ('http: // www.111cn.net '+ Sys. safari );     } }