document.getElementById（'mybox'）和mybox有什么区别？ [英] What is the difference between document.getElementById('mybox') and mybox?

问题描述

可能重复：

document.getElementById（“ someId”）vs。 someId

例如我有一个 id的元素=mybox属性，用 document.getElementById（'mybox'）和 mybox调用它是否有任何区别直接，因为我看到它们在大多数浏览器中都一样吗？ jsfiddle显示实例 http://jsfiddle.net/usmanhalalit/TmS3k/

For example I have an element with id="mybox" attribute, is there any difference between calling it with document.getElementById('mybox') and mybox directly, as I see both work same in most browsers? The jsfiddle shows live example http://jsfiddle.net/usmanhalalit/TmS3k/

如果没有区别那么为什么 document.getElementById（'mybox'）如此受欢迎，直接调用 mybox 是不好的做法？

If there is no difference then why document.getElementById('mybox') is so popular, is it a bad practice to call mybox directly?

推荐答案

某些呈现模式中的一些浏览器将为每个具有id的元素创建一个全局变量。

Some browsers in some rendering modes will create a global variable for each element with an id.

它是非标准的，无处不在，绝对不能依赖。

It is non-standard, won't work everywhere and definitely can't be depended upon.

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