What does the javascript attributes attribute do?-Front-end Q&A-php.cn

What does the javascript attributes attribute do?

青灯夜游

Release： 2021-10-25 17:41:53

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In JavaScript, the attributes attribute can obtain and return the attribute collection of the specified element node, that is, the NamedNodeMap object; the syntax is "element node.attributes".

What does the javascript attributes attribute do?

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

The attributes attribute returns the attribute collection of the specified node, that is, the NamedNodeMap object.

Tip: You can use the length property to determine the number of properties, and then you can iterate through all property nodes and extract the information you need.

Syntax: node.attributes

Return value: NamedNodeMap object, representing a collection of attributes.

<!DOCTYPE html>
<html>
<body>

<p>点击按钮来查看 button 元素拥有多少属性。</p>

<button id="myBtn" onclick="myFunction()">试一下</button>

<p id="demo"></p>

<script>
function myFunction() {
    var x = document.getElementById("myBtn").attributes.length;
    document.getElementById("demo").innerHTML = x;
}
</script>


</body>
</html>

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Let’s guess what the result is? The result should be 2 (the id and onclick attributes of the button element). Take a look at the renderings:

What does the javascript attributes attribute do?

[Recommended learning: javascript advanced tutorial]

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