Actionscript - 获取当前函数的名称 [英] Actionscript - Obtain the name of the current function

问题描述

我想从函数内部获取函数的名称.例如:

I want to get the name of a function from inside that function. e.g.:

function blah() {
    //I want to get the string "blah" here, from the function's name
}

或者至少是 Function 对象?

Or at least the Function object?

推荐答案

使用 arguments.callee 获取对当前函数的引用.

Use arguments.callee to get a reference to the current function.

我想获取函数名称，这有点棘手:所有函数都被视为方法闭包(可以作为参数传递的代码段)，因此它们不拥有对封闭类的引用类型，它们也没有当前名称".

I you want to get the function name, it is a bit trickier: All functions are treated as method closures (pieces of code which can be passed around as an argument), so they do not own a reference to an enclosing class type, nor do they have a "current name".

但是，如果(并且仅如果)该方法是公共的，并且您想从包含该方法的实例对象的类声明中获取方法名称，则可以使用 describeType:

However, if (and only if) the method is public, and you want to get the method name from the class declaration of an instance object containing the method, you can use describeType:

public function someFunction() : void {
    var callee:Function = arguments.callee;
    trace (getFunctionName(callee, this)); // ==> someFunction
}

private function someOtherFunction() : void {
    var callee:Function = arguments.callee;
    trace (getFunctionName(callee, this)); // ==> not found
}

private function getFunctionName (callee:Function, parent:Object):String {
    for each ( var m:XML in describeType(parent)..method) {
        if ( parent[m.@name] == callee) return m.@name;
    }
    return "not found";
}

请注意，当您从构造函数调用 someFunction() 时，这将不起作用，因为对象未完全实例化 - 构造函数中的 describeType(this) 会导致编译错误.

Note that this would not work when you call someFunction() from a constructor, because the object is not fully instantiated - describeType(this) in a constructor would cause a compilation error.

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