HTMLElement.offsetTop
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
HTMLElement.offsetTop 为只读属性，它返回当前元素相对于其 offsetParent 元素的顶部内边距的距离。
语法
topPos = element.offsetTop;
参数
topPos为返回的像素数。
示例
js
var d = document.getElementById("div1");
var topPos = d.offsetTop;
if (topPos > 10) {
// div1 距离它的 offsetParent 元素的顶部的距离大于 10 px
}
规范
| Specification |
|---|
| CSSOM View Module # dom-htmlelement-offsettop |
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.)