How to determine whether a function exists in jquery

Jquery method to determine whether a function exists: first create a code sample file; then pass "if($.isFunction(fun)){eval("testFun('txt')");}}catch( e){$.alert...}" statement can be used to determine whether the function exists.

The operating environment of this tutorial: windows7 system, jquery1.10.0 version, Dell G3 computer.

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jquery determines whether the function exists?

You can use the $.isFunction() function in jquery to determine whether the function exists. The $.isFunction() function is used to determine whether the specified parameter is a function.

Example:

var fun = "testFun";  // 函数的名称
try{
　if($.isFunction(fun)){
　　　　 eval("testFun('txt')");   // "txt"是函数参数
 } 
}catch(e){ 
　　$.alert(fun +'不是函数!'); 
}

Note the use of "eval()"!!!

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