检查jQuery对象中特定.data()值的正确方法? [英] Proper way to check for particular .data() value in a jQuery object?

问题描述

我想检查一下是否已将jQuery数据值应用于对象.例如，其他地方的代码可能会将数据分配给对象:

I'd like to check to see if a jQuery data value has been applied to an object. For instance, code elsewhere may assign data to an object:

$myObject.data('hello','world');

在其他地方，我想检查是否为数据属性hello赋了值.

Elsewhere, I want to check to see if a value was given to the data property hello.

处理此问题的正确方法是什么? .hasData似乎是显而易见的选择，但似乎不像'hasClass'那样工作，因为您似乎无法向其传递特定的数据元素名称.

What is the proper way to handle this? .hasData seemed like the obvious choice but appears to not work like 'hasClass' does in that you can't seem to pass a particular data element name to it.

推荐答案

要获取属性(例如，用于比较)，请使用.data和一个参数:

To obtain the property (e.g. for comparison), use .data with one argument:

$myObject.data('hello')

当数据不存在时，它返回undefined值.

It returns the undefined value when the data does not exists.

这篇关于检查jQuery对象中特定.data()值的正确方法?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！