Getting CLASS objects with native JS (simple and practical) _ javascript tips-js tutorial

This article mainly introduces how to use native JS to obtain CLASS objects. Friends who have read dom programming art may know that it is the most commonly used .... I think of dom programming art.

   
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  Script function getElementsClass (classnames) {var classobj = new Array (); // defines the Array var classint = 0; // defines the Array subscript var tags = document. getElementsByTagName ("*"); // obtain all HTML tags for (var I in tags) {// traverse tags if (tags [I]. nodeType = 1) {// determine the node type if (tags [I]. getAttribute ("class") = classnames) // identifies and requires the same CLASS name, and forms an array {classobj [classint] = tags [I]; classint ++ ;}}return classobj; // returned array} // The following is the var a = getElementsClass ("ca"); a [0]. onclick = function () {alert ("");} a [1]. innerHTML = 'Here we are '; script

Sometimes multiple dom classes are the same and can be processed as follows:

The Code is as follows:

Var a = getElementsClass ("ca ");
For (var I = 0; I (function (I ){
Alert (a [I])
}) (I)
}

If there are multiple identical classes, you can use them together. If you want to achieve JQ, you can directly click the class. You also need to do some complicated processing.