如何使用名称等于字符串的名称定义javascript函数

Question

Let's say I'm given a string, and I want to define a function with a name of that string. How can I do this?

UPDATE:

I forgot to mention that I do not want to set an anonymous function to a property because I would also like to dynamically grab the function's name from inside the function ie. arguments.callee.name

Answer 1

Like this:

var functionName = "myfunction"
window[functionName] = function() {
    // your function here
} 

Depending on the requirements, maybe something like this would work:

var myFunctionGenerator = function(name) {return function(message) {
    alert("hi, this is a function named '" + name + "'.  The parameter passed is '" + message + "'.");
}}

var myFunction = myFunctionGenerator('some function name');
myFunction('a parameter');
// hi, this is a function named 'some function name'.  The parameter passed is 'a parameter'.

Answer 2

If your declaring the function, use eval() . Just type a string representation of the argument your trying to execute for example:

eval("function name(){alert('a');}");

You can then call that method by normal convention, name(); .

If you already have the function name and want to call that function with a string representation you can use the eval() method, although its not always optimal for performance. You will have this:

var fnName = "functionName";
var params = "param1";
var fnNameWithParams = "functionName("+params+")";
eval(fnNameWithParams);

A better approach may be:

var fnName = "functionName";
var params = "param1";
var fnToCall = window[fnName];
fnToCall(params);