javascript - 我将其名称作为字符串时如何执行JavaScript函数(How to execute a JavaScript function when I have its name as a string)

Question

I have the name of a function in JavaScript as a string.

(我有一个JavaScript函数的名称作为字符串。)

How do I convert that into a function pointer so I can call it later?

(如何将其转换为函数指针，以便以后可以调用？)

Depending on the circumstances, I may need to pass various arguments into the method too.

(根据情况，我可能还需要将各种参数传递给该方法。)

Some of the functions may take the form of namespace.namespace.function(args[...]) .

(一些功能可能采用namespace.namespace.function(args[...]) 。)

  ask by Kieron translate from so

Answer 1

Don't use eval unless you absolutely, positively have no other choice.

(除非您绝对没有其他选择，否则不要使用eval 。)

As has been mentioned, using something like this would be the best way to do it:

(如前所述，使用以下方法将是最好的方法：)

window["functionName"](arguments);

That, however, will not work with a namespace'd function:

(但是，这将不适用于名称空间的功能：)

window["My.Namespace.functionName"](arguments); // fail

This is how you would do that:

(您将按照以下方式进行操作：)

window["My"]["Namespace"]["functionName"](arguments); // succeeds

In order to make that easier and provide some flexibility, here is a convenience function:

(为了使操作更简单并提供一些灵活性，这里提供了一个便捷功能：)

function executeFunctionByName(functionName, context /*, args */) {
  var args = Array.prototype.slice.call(arguments, 2);
  var namespaces = functionName.split(".");
  var func = namespaces.pop();
  for(var i = 0; i < namespaces.length; i++) {
    context = context[namespaces[i]];
  }
  return context[func].apply(context, args);
}

You would call it like so:

(您可以这样称呼它：)

executeFunctionByName("My.Namespace.functionName", window, arguments);

Note, you can pass in whatever context you want, so this would do the same as above:

(请注意，您可以根据需要传递任何上下文，因此与上述操作相同：)

executeFunctionByName("Namespace.functionName", My, arguments);