jquery stores data in elements: data()

Storing data in elements: data()

data(): Read custom data whose attribute name starts with data- in the element, you can omit the data- prefix

var res = $('#pic').data('job')

If you use the previous attr() method, you must write the complete attribute name

var res = $('#pic').attr('data-job')

data() is also a method with its own reader and setter

$('#pic').data('data-course', 'php项目开发课程')

If it is dynamically set automatically Defining attributes cannot be obtained if you omit the prefix

var res = $('#pic').data('course')

You need to add the prefix

var res = $('#pic').data('data-course')

Can data() obtain the native attributes on the element? Unable to read

var res = $('#pic').data('title')

However, it supports dynamically setting the title attribute, which is limited to use in scripts. The original value has not changed.

var res = $('#pic').data('title','hellow')

Now you can read the value of title in the script, although this value is different from the native alt value. Same

var res = $('#pic').data('title')

Similarly, data() also has a corresponding removeData() used to delete custom attributes or attributes created by it

var res = $('#pic').removeData('title') //仅删除临时创建的,原值不受影响 var res = $('#pic').removeData('data-course') //仅删除临时创建的 var res = $('#pic').data('data-course') //仅删除临时创建的

The custom attributes that come with the original tag cannot be deleted.

var res = $('#pic').removeData('data-job') var res = $('#pic').data('job')

View the results in the console

console.log(res)

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