javascript - Overriding history.pushState leads to error in opera 11 -

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i'm injecting following code webpage via greasemonkey script/opera extension trap history.pushstate command, can processing whenever it's fired , still allow pushstate command continue afterwards.

(function(history){   var pushstate = history.pushstate;   history.pushstate = function(state) {        if (typeof history.onpushstate == "function") {           history.onpushstate({state: state});         }         alert('pushstate called')         return pushstate.apply(history, arguments);   } })(window.history);

the code works fine in ff4 , chrome, in opera 11, following error, if page calls history.replacestate command:

uncaught exception: typeerror: 'window.history.replacestate' not function

does know how can fix above code work opera chrome , firefox?

in opera 11.00, revision 1156, history api supported these 

>>> history. back, current, forward, go, length, navigationmode

the full html5 history api not yet covered opera 11.00. in general if discover, explore supported, can use console mode of dragonfly, web developer tool.


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