An article analyzing the use of attr() in jquery

jQuery is a lightweight JavaScript library. Its emergence greatly simplifies the writing of JavaScript scripts and greatly improves the development efficiency of Web applications. The attr method brings infinite convenience to web application developers.

attr method is a very important method in jQuery. It is used to get or set the attribute value of HTML elements. This method is simple, efficient, and cross-browser compatible. This method plays a very critical role when implementing dynamic effects, fact verification, and manipulating the DOM through JS.

The usage of the attr method is very simple:

1. Get the element attribute value

When we want to get the specific attribute of the HTML element, we can use the parameters The attr method of the attribute name, for example:

var link = $('a'); var href = link.attr("href");

In the above code, we obtain the href attribute value of an a tag element named link and store it as a string variable in href in variables.

2. Set element attribute value

When we need to set a specific attribute of an HTML element, we also use the attr method whose parameters are the attribute name and attribute value, for example:

var link = $('a'); link.attr("href", "http://www.example.com/");

In the above code, we set the href attribute of an a tag element named link to "http://www.example.com/", which implements a link to jump to the specified website. function.

3. Get the attribute values of multiple elements at the same time

When we need to get specific attributes of multiple elements, we can do it through callback functions and each method, for example:

$('a').each(function() { console.log($(this).attr("href")); });

In the above code, we used the each method to traverse all a tag elements, and obtained their href attribute values through the attr method in the callback function and output them on the console.

Summary:

In front-end development, simple, efficient, cross-browser compatible tools are always what we need most. As a practical and important method in jQuery, the attr method is very convenient when getting and setting attribute values of HTML elements. Developers can make full use of the attr method to enrich the content of web applications, increase user experience, and greatly improve their code efficiency.

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