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jquery stores data in elements: data()

无忌哥哥
无忌哥哥Original
2018-06-29 13:39:502019browse

Storing data in elements: data()

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>3.在元素中存储数据:data()</title>
</head>
<body>
<img src="../images/peter.jpg" width="200" alt="php中文网" title="朱老师" id="pic" data-job="php中文网朱老师">
</body>
</html>

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

var res = $(&#39;#pic&#39;).data(&#39;job&#39;)

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

var res = $(&#39;#pic&#39;).attr(&#39;data-job&#39;)

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

$(&#39;#pic&#39;).data(&#39;data-course&#39;, &#39;php项目开发课程&#39;)

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

var res = $(&#39;#pic&#39;).data(&#39;course&#39;)

You need to add the prefix

var res = $(&#39;#pic&#39;).data(&#39;data-course&#39;)

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

var res = $(&#39;#pic&#39;).data(&#39;title&#39;)

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

var res = $(&#39;#pic&#39;).data(&#39;title&#39;,&#39;hellow&#39;)

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

var res = $(&#39;#pic&#39;).data(&#39;title&#39;)

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 = $(&#39;#pic&#39;).data(&#39;data-course&#39;)  //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 = $(&#39;#pic&#39;).data(&#39;job&#39;)

View the results in the console

console.log(res)

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