对于此处给出的两种版本，您都应使用

For both the variations given here you should get the value using

.data('sampleattributename')

骆驼套(.data('sampleAttributeName'))用于属性如下:

The camel casing ( .data('sampleAttributeName')) is for when the attribute is like this:

<a  data-sample-attribute-name="something">Anchor</a>

检查此jsfiddle