What does attr mean in javascript-Front-end Q&A-php.cn

Table of Contents

What does attr mean in javascript

Home

Web Front-end

Front-end Q&A

What does attr mean in javascript

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

Feb 08, 2022 am 11:14 AM

html javascript front end

In JavaScript, attr is an attribute operation method, which can set or return the attribute value of the selected element. The syntax is "$(selector).attr(attribute)" or "$(selector) .attr(attribute,value)”.

What does attr mean in javascript

The operating environment of this tutorial: Windows 10 system, JavaScript version 1.8.5, Dell G3 computer.

What does attr mean in javascript

attr() method sets or returns the attribute value of the selected element.

Returns the attribute value of the selected element.

Syntax

$(selector).attr(attribute)

Copy after login

attribute specifies the attribute whose value is to be obtained.

Set the attributes and values of the selected element.

Syntax

$(selector).attr(attribute,value)

Copy after login

attribute specifies the name of the attribute.

value Specifies the value of the attribute.

Set the attributes and values of the selected element.

$(selector).attr(attribute,function(index,oldvalue))

Copy after login

attribute specifies the name of the attribute.

function(index,oldvalue) specifies the function that returns the attribute value.

This function can receive and use the index value of the selector and the current attribute value.

Set more than one attribute and value for the selected element.

Syntax

$(selector).attr({attribute:value, attribute:value ...})

Copy after login

attribute:value Specifies one or more attribute/value pairs.

The example is as follows:

<html>
<head>
<script type="text/javascript" src="/jquery/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function(){
  $("button").click(function(){
    $("img").attr("width",function(n,v){
      return v-50;
    });
  });
});
</script>
</head>
<body>
<img  src="/static/imghw/default1.png"  data-src="/i/eg_smile.gif"  class="lazy"      style="max-width:90%"  style="max-width:90%" / alt="What does attr mean in javascript" >
<br />
<button>减少图像的宽度 50 像素</button>
</body>
</html>

Copy after login

Output result:

What does attr mean in javascript

After clicking the button:

What does attr mean in javascript

Related recommendations: javascript learning tutorial

The above is the detailed content of What does attr mean in javascript. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn