javascript - D3数据与数据有什么区别？(What is the difference D3 datum vs. data?)

Question

Can someone please explain the difference between datum() and data() in D3.js?

(有人可以解释D3.js中datum（）和data（）之间的区别吗？)

I see both being used and I am not sure why you should choose one over the other?

(我看到两个都被使用了，我不确定你为什么要选择一个而不是另一个？)

  ask by josephmisiti translate from so

Answer 1

I found the correct answer here from Mike himself:

(我从迈克本人那里找到了正确的答案：)

D3 - how to deal with JSON data structures?

(D3 - 如何处理JSON数据结构？)

If you want to bind your data to a single SVG element, use

(如果要将数据绑定到单个SVG元素，请使用)

(...).data([data])

or

(要么)

(...).datum(data)

If you want to bind your data to multiple SVG elements

(如果要将数据绑定到多个SVG元素)

(...).data(data).enter().append("svg")

.....

(.....)