Hanks10100 commented on issue #1798: js error like "xxx is undefine" will not call onJSException but just log URL: https://github.com/apache/incubator-weex/issues/1798#issuecomment-441011430 That's because js framework wrapped `try catch` to the [callback functions](https://github.com/apache/incubator-weex/blob/0.19.0/runtime/bridge/CallbackManager.js#L65-L70) and [event handlers](https://github.com/apache/incubator-weex/blob/rc-0.20.0/runtime/vdom/Element.js#L485-L496) and console it out. I think it's a good idea to throw the exceptions to native handlers, I'll remove those `try catch` in the next version.
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