jQuery .data可以使用破折号访问驼峰式案例密钥

Question

任何人都可以解释为什么这样做： $('#someId').data('typeId', 2); $('#someId').data('type-id'); // will return 2 $('#someId').data('typeId', 2); $('#someId').data('type-id'); // will return 2

这也是小提琴： http : //jsfiddle.net/L6nLpgdb/

谢谢 ！

Answer 1

检查此链接

The custom data attributes is transformed to a key for the DOMStringMap entry with the following rules:

    any dash (U+002D) is removed;
    any letter following a dash (U+002D), before its removal, is set in its uppercase counterpart.