is there a function for webView.canGoBack

[moonljt521]

I want to override my backBtn of toobar , I need judge the webview has last stack record ，I will close the page if there is not，
is there a function for webView.canGoBack，please 。。。

[huuang]

I wonder why there is no canGoBack function, but has goBack function

[apm29]

need this function

[charafau]

#432