如何在匿名函数/闭包中动态访问变量？

Question

To keep the global namespace clean, my JavaScript code is wrapped like this:

(function() {
    /* my code */
})();

Now I have some variables declared in this scope which I want to access using a variable variable name (eg the name is 'something' + someVar ). In the global scope I'd simply use window['varname'] , but obviously that doesn't work.

Is there a good way to do what I want? If not I could simply put those variables inside an object to use the array notation...

Note: eval('varname') is not an acceptable solution. So please don't suggest that.

Answer 1

This is a good question because this doesn't point to the anonymous function, otherwise you would obviously just use this['something'+someVar] . Even using the deprecated arguments.callee doesn't work here because the internal variables aren't properties of the function. I think you will have to do exactly what you described by creating either a holder object...

(function() {
  var holder = { something1: 'one', something2: 2, something3: 'three' };

  for (var i = 1; i <= 3; i++) {
    console.log(holder['something'+i]);
  }
})();

Answer 2

(function(globals) {
    /* do something */
    globals[varname] = yourvar;
})(yourglobals);

Answer 3

邪恶的解决方案/黑客：将您需要的变量放在帮助对象obj 中，并避免通过使用 use with(obj){ your current code ... } 将当前用途更改为点表示法