java script - DOM permission

How can I call a function in the parent, from iframe (child); when i do it in following way, browser says

"Permission denied for <http://localhost> 
to get property Window.func from <http://localhost:8080>.
    [Break On This Error] parent.window.func(); "

call in iframe

parent.window.func()

the function in the parent

function func(){
        alert("test开发者_开发知识库")
};

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For security reasons, you cannot interact with a frame containing a webpage in a different domain or port.

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For some reason, you are doing a cross-domain request, which breaks the same origin policy. You can only access other windows if they are from the same domain as the window in question.

http://localhost is a different domain to http://localhost:8080; the different ports make the request forbidden.