How to obtain class in dom using JavaScript _ javascript skills

This article mainly introduces how to obtain the class in dom using JavaScript, which involves the use of javascript to operate dom nodes, for more information about how to use JavaScript to obtain classes in dom, see the example in this article. Share it with you for your reference. The specific implementation method is as follows:

  Script function getClass (node, classname) {if (node. getElementsByClassName) {return node. getElementsByClassName (classname); // if this tag exists, return} else {var elems = node. getElementsByTagName (node), defualt = []; for (var I = 0; I <elems. length; I ++) {// traverse all tags if (elems [I]. className. indexOf (classname )! =-1) {// search for the label defualt [defualt. length] = elems [I] ;}} return defualt ;}} window. onload = function () {var text = document. getElementById ('text'), cs = getClass (text, 'cs '); document. write (cs. innerHTML = 'cs ');} script
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I hope this article will help you design javascript programs.