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This article mainly introduces the relevant knowledge of "how to use the data function in jquery". The editor shows you the operation process through an actual case. The operation method is simple and fast, and it is practical. I hope this article "how to use the data function in jquery" can help you solve the problem.

In jquery, data means "data". The data () function is used to access data on the specified element and return the set value. the data accessed through this function is temporary data, and the data stored after the page is refreshed will be removed with the syntax of "$.data (element,key,value)".

The operating environment of this tutorial: windows10 system, jquery3.2.1 version, Dell G3 computer.

What is the meaning of data in jquery

The $.data () function is used to access data on the specified element and returns the set value.

Hint: 1. This is an underlying method, and the .data () method is more convenient to use.

two。 The data accessed through the data () function is temporary data, and once the page is refreshed, the previously stored data will be removed.

3. This method currently does not provide cross-platform settings on XML documents, and Internet Explorer does not allow data to be attached through custom properties in XML documents.

Grammar

Usage one

$.data (element, key, value)

Note: 1. The data accessed through the data () function is temporary data, and once the page is refreshed, the previously stored data will be removed.

2. Undefined is an unrecognized data value. Calling jQuery.data (el, "name", undefined) returns the corresponding "name" data, which is equivalent to jQuery.data (el, "name").

We can set different values on an element and get these values:

JQuery.data (document.body, 'foo', 52); jQuery.data (document.body,' bar', 'test')

Usage two

$.data (element, key)

We can set different values on an element and get these values:

Alert (jQuery.data (document.body, 'foo')); alert (jQuery.data (document.body))

Parameter description

Element Element type DOM object to store data

Key is optional. The key name string specified by the String type.

Value is optional. Any type of data that the Object type needs to store.

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