Get all variables of the current function() scope

问题

I'm having a problem. I want to get the current function scrope. I have this example code that i'm working ok.

function nittle(){

    var Pen = new Dot(); // Generated dynamical through eval()
    .....

    for(key in window) {
        if( window[key] instanceof Dot ){
            alert("found it");
        }
    }

}

But it seems not to work within the function scope. Work outside of it. Is there a work around ?

Thanks.

回答1:

I'm not aware of any way to determine programmatically what variables have been declared inside a function, except perhaps to use nittle.toString() and then attempting to parse it yourself to find all the variables. ~~Maybe that could work for you? (But it's too messy for me to attempt here.)~~ UPDATE: but if the variables are created via eval() it won't work, you'd just see the eval() statement in the function's string representation.

Is there a work around ?

You could declare a single object in your function and change all the variables into properties of that object:

function nittle() {
  var nittleVars = {
     var1 : "something",
     Pen : new Dot(),
     etc : "whatever"
  };

  for (var key in nittleVars){
    if( nittleVars[key] instanceof Dot ){
        alert("found it");
    }
  }
}

Your update indicates the variables are created with eval() - you could still do that with the object properties idea:

  eval("nittleVars.newVar = new Dot()");  // inside the function

来源：https://stackoverflow.com/questions/16633958/get-all-variables-of-the-current-function-scope

标签

javascript

jquery

function

Prototype

instance