给定以下代码:
function A(b:Function) { }
如果函数A()中,我们将函数名作为参数'b'传递进来,那么我们能否确定传入的函数名?这个答案在AS2和AS3中有所不同吗?
给定以下代码:
function A(b:Function) { }
如果函数A()中,我们将函数名作为参数'b'传递进来,那么我们能否确定传入的函数名?这个答案在AS2和AS3中有所不同吗?
我使用以下内容:
private function getFunctionName(e:Error):String {
var stackTrace:String = e.getStackTrace(); // entire stack trace
var startIndex:int = stackTrace.indexOf("at ");// start of first line
var endIndex:int = stackTrace.indexOf("()"); // end of function name
return stackTrace.substring(startIndex + 3, endIndex);
}
使用方法:
private function on_applicationComplete(event:FlexEvent):void {
trace(getFunctionName(new Error());
}
输出: FlexAppName/on_applicationComplete()
有关该技术的更多信息可以在Alex网站上找到:
我一直在尝试建议的解决方案,但在某些时候所有的解决方案都遇到了麻烦。主要是由于固定或动态成员的限制。我做了一些工作,将两种方法结合起来。请注意,它仅适用于公开可见的成员 - 在所有其他情况下返回null。
/**
* Returns the name of a function. The function must be <b>publicly</b> visible,
* otherwise nothing will be found and <code>null</code> returned.</br>Namespaces like
* <code>internal</code>, <code>protected</code>, <code>private</code>, etc. cannot
* be accessed by this method.
*
* @param f The function you want to get the name of.
*
* @return The name of the function or <code>null</code> if no match was found.</br>
* In that case it is likely that the function is declared
* in the <code>private</code> namespace.
**/
public static function getFunctionName(f:Function):String
{
// get the object that contains the function (this of f)
var t:Object = getSavedThis(f);
// get all methods contained
var methods:XMLList = describeType(t)..method.@name;
for each (var m:String in methods)
{
// return the method name if the thisObject of f (t)
// has a property by that name
// that is not null (null = doesn't exist) and
// is strictly equal to the function we search the name of
if (t.hasOwnProperty(m) && t[m] != null && t[m] === f) return m;
}
// if we arrive here, we haven't found anything...
// maybe the function is declared in the private namespace?
return null;
}
getSavedThis()
只在 Flash Player 的调试版本中有效。 - Art public function testFunction():void {
trace("this function name is " + FunctionUtils.getName()); //will output testFunction
}
/** Gets the name of the function which is calling */
public static function getName():String {
var error:Error = new Error();
var stackTrace:String = error.getStackTrace(); // entire stack trace
var startIndex:int = stackTrace.indexOf("at ", stackTrace.indexOf("at ") + 1); //start of second line
var endIndex:int = stackTrace.indexOf("()", startIndex); // end of function name
var lastLine:String = stackTrace.substring(startIndex + 3, endIndex);
var functionSeperatorIndex:int = lastLine.indexOf('/');
var functionName:String = lastLine.substring(functionSeperatorIndex + 1, lastLine.length);
return functionName;
}
function foo()
{
}
function bar()
{
}
function a(b : Function)
{
if( b == foo )
{
// b is the foo function.
}
else
if( b == bar )
{
// b is the bar function.
}
}
你只是想要一个参考,以便之后可以再次调用函数吗?如果是这样,请尝试将函数设置为变量作为参考。 var lastFunction: Function;
var func:Function = function test():void
{
trace('func has ran');
}
function A(pFunc):void
{
pFunc();
lastFunction = pFunc;
}
A(func);
我不知道这是否有帮助,但可以获取调用函数的引用参数(据我所知,仅适用于ActionScript 3)。