javascript 现在 document.all 和 document.layers 已过时
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are document.all and document.layers obsolete now
提问by Paul
I am going through some (old?) native javascript and I encountered a separation of document.getElementById, document.all and document.layers.
我正在使用一些（旧的？）原生 javascript，我遇到了 document.getElementById、document.all 和 document.layers 的分离。
From what I know, document.all and document.layers are obsolete now, but I just wanted to make sure.
据我所知， document.all 和 document.layers 现在已经过时了，但我只是想确定一下。
回答by Guffa
Yes, they are obsolete.
是的，它们已经过时了。
The document.allcollection is specific to Internet Explorer. The document.layerscollection was specific to Netscape. Neither is in the standards.
该document.all集合特定于 Internet Explorer。该document.layers集合是特定于 Netscape 的。两者都不在标准中。
Today we use document.getElementByIdinstead.
今天我们用document.getElementById代替。
另见：https: //developer.mozilla.org/en-US/docs/Mozilla_Web_Developer_FAQ#JavaScript_doesn.E2.80.99t_work.21_Why.3F
回答by ZER0
Yes, they are. They comes from a period where Internet Explorer 4 and Netscape 4.x were the main browsers: document.layerswas used by Netscape, and document.allfrom IE. The first is definitely unused anymore, where I guess document.allis still used for legacy in IEs.
对，他们是。它们来自 Internet Explorer 4 和 Netscape 4.x 是主要浏览器的时期：document.layers由 Netscape 和document.allIE 使用。第一个肯定不再使用了，我猜document.all它仍然用于 IE 中的遗留。
