javascript 在javascript中按类获取元素并计算其中元素的数量
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Get element by class in javascript and count the number of elements in them
提问by Kaushik Balasubramanain
Possible Duplicate:
How to Get Element By Class in JavaScript?
可能的重复：
如何在 JavaScript 中按类获取元素？
I have a div tag with a class name on it. I want to get that div tag using the class name and count the number of elements in them. I am not in a position to filter using ID. How do i achieve this?
我有一个带有类名的 div 标签。我想使用类名获取该 div 标签并计算其中的元素数量。我无法使用 ID 进行过滤。我如何实现这一目标？
回答by Shreedhar
Had you googled it.
如果你用谷歌搜索它。
var arr = document.getElementsByClassName("classname")
arr.length
