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如何用js获取伪元素的坐标、长宽?

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如红框,F12能拿到伪元素实际大小,请问如何用js获取这个值?是否可以用js获取伪元素在页面上的坐标?
谢谢。


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window.getComputedStyle
不过这个拿到的是类 style 对象,真实尺寸可能还需要自行计算,对 CSS 功底要求比较高。


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