Prerequisite: The document click event is bound in the project. A tag in the document subclass also binds the click time. To achieve the effect, the document event will not be triggered after the click event is triggered. That is, if you organize the bubbling of events, you can add the method to prevent the bubbling of events (e.stopPropagation(); e.preventDefault();) and you can't do it. This only happens under Google now, and ff will not happen.
Reason: The hyperlink's href="#" triggered later than click,
Solution: add return false after the method;