Some method use easy in JavaScript
Like jQuery node selector
$('div') = node('div')
Use in IE8 up
Like jQuery index()
indexInParent(<DOM Element>
)
It can find current element index from parent DOM element
Delete DOM element
delElement(<DOM Element>
)
Add class to element
addClass(<DOM Element>
, <class name>
)
remove class to element
removeClass(<DOM Element>
, <class name>
)
Number trans to time
toHHMMSS(<Number>
)
Time format is HH:MM:SS