Detailed explanation of jQuery.isFunction() function usage examples

jQuery.isFunction() function is used to determine whether the specified parameter is a function.

This function belongs to the global jQuery object.

Syntax

jQuery 1.2 adds this static function.

jQuery.isFunction( object )

Parameters

Parameter Description

object Any type of any value that needs to be judged.

Return value

jQuery.isFunction()The return value of the function is of Boolean type. If the specified parameter is a JS function object, it returns true, otherwise it returns false.

Example & Description

The jQuery sample code for the jQuery.isFunction() function is as follows:

//在当前页面内追加换行标签和指定的HTML内容
function w( html ){
    document.body.innerHTML += "<br/>" + html;
}
function foo(){
    alert("CodePlayer");    
}
w( $.isFunction( foo ) ); // true
w( $.isFunction( function(){ } ) ); // true
w( $.isFunction( new Function("x", "y", "return x + y;") ) ); // true
w( $.isFunction( null ) ); // false
w( $.isFunction( true ) ); // false
w( $.isFunction( { } ) ); // false
w( $.isFunction( [ ] ) ); // false

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