Check if page is in Iframe for Google Chrome

I 开发者_JS百科have tried many properties of window to see if a page in an iframe can tell if it is in an iframe. I have tried:

if(top.location!= self.location) //doesn't work in Google Chrome
   alert("I am in an iframe!")

And this doesn't work (works on all browsers but Chrome). I am writing a userscript for Firefox and Chrome but Chrome really doesn't behave. Is there a way to tell if Chrome can detect if its page is in an iframe?

---

This works for frames I would assume it also works with iFrames

if (top === self) { 
  // no frame
} else { 
  //frame 
}

---

window.frameElement is supported in even the most ancient browsers. It identifies an iframe, embed, or object in which the current window is embedded.

if(!!window.frameElement){
  //code to be executed if we are in an iframe
} 

More here.