The acquisition of height and width in JS

JS Gets a brief introduction to various widths and heights :

ScrollHeight: Gets the scroll height of the object.
ScrollLeft: Sets or gets the distance between the left edge of the object and the leftmost of the currently visible content in the window
ScrollTop: Sets or gets the distance between the top of the object and the top of the visible content in the window
ScrollWidth: Gets the scrolling width of the object
Offsetheight: Gets the height of the object relative to the layout or parent coordinates specified by the parent coordinate OffsetParent property
Offsetleft: Gets the calculated left position of the object relative to the layout or the parent coordinate specified by the OffsetParent property
OffsetTop: Gets the computed top position of the object relative to the layout or the parent coordinate specified by the OffsetTop property
Event.clientx horizontal coordinates of relative documents
Event.clienty vertical coordinates of relative documents
Event.offsetx horizontal coordinates relative to the container
Event.offsety the vertical coordinate of the relative container
Document.documentElement.scrollTop The vertical scrolling value
Event.clientx+document.documentelement.scrolltop horizontal coordinates of relative documents + amount of vertical scrolling

The difference between offsetwidth and style.width

First, OFFSETTOP returns a number, and Style.top returns a string, in addition to the number of units: px.

Second, OffsetTop read only, and Style.top can read and write.

If the top style is not specified for the HTML element, Style.top returns an empty string.

The acquisition of height and width in JS