这是一个实验中的功能
此功能某些浏览器尚在开发中,请参考浏览器兼容性表格以得到在不同浏览器中适合使用的前缀。由于该功能对应的标准文档可能被重新修订,所以在未来版本的浏览器中该功能的语法和行为可能随之改变。
ResizeObserver
构造器创新一个新的 ResizeObserver
对象,用于接收 Element
内容区域的改变 或 SVGElement
的边界框改变改变。
语法
var ResizeObserver = new ResizeObserver(callback)
参数
- 回调函数
- The method called whenever a resize occurs. The method is called with an array of
ResizeObserverEntry
objects.
当尺寸发生变化时触发回调,使用ResizeObserverEntry
对象数组调用该方法。
示例
The following example shows the dimensions of a box inside it, as text, upon resizing.
下面示例展示了box调整大小时,其内部文本显示为尺寸大小。
const resizeObserver = new ResizeObserver(entries => {
for (let entry of entries) {
const boxEl = entry.target;
const dimensions = entry.contentRect;
boxEl.textContent = `${dimensions.width} x ${dimensions.height}`;
}
});
resizeObserver.observe(document.querySelector('.box:nth-child(2)'));
规范
Specification | Status | Comment |
---|---|---|
Resize Observer ResizeObserver |
Editor's Draft | Initial definition. |
浏览器兼容性
BCD tables only load in the browser
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.