HTMLElement.offsetTop - Web APIs 编辑

The HTMLElement.offsetTop read-only property returns the distance of the outer border of the current element relative to the inner border of the top of the offsetParent node.

Syntax

topPos = element.offsetTop;

Parameters

• topPos is the number of pixels from the top of the closest relatively positioned parent element.

Example

var d = document.getElementById("div1");
var topPos = d.offsetTop;

if (topPos > 10) {
  // object is offset more
  // than 10 pixels from its parent
}

Specifications

Browser compatibility

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In compliance with the specification, this property will return null on Webkit if the element is hidden (the style.display of this element or any ancestor is "none") or if the style.position of the element itself is set to "fixed".

This property will return null on Internet Explorer (9) if the style.position of the element itself is set to "fixed". (Having display:none does not affect this browser.)