<!DOCTYPE html><html> <head> <title>JavaScript & jQuery - Chapter 5: Document Object Model - Remove Attribute</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <link rel="stylesheet" href="css/c05.css"> </head> <body> <div id="page"> <h1 id="header">List</h1> <h2>Buy groceries</h2> <ul> <li id="one" class="hot"><em>fresh</em> figs</li> <li id="two" class="hot">pine nuts</li> <li id="three" class="hot">honey</li> <li id="four">balsamic vinegar</li> </ul> </div> <script src="js/remove-attribute.js"></script> </body></html>以上为HTML代码，以下为JavaScript代码。书上说“这段脚本检查了选中元素是否包含class属性，如果包含，就把它移除掉。”按我的理解应该移除第一个啊，怎么会移除最后一个呢？是我理解的不对？var firstItem = document.getElementById('one'); // Get the first itemif (firstItem.hasAttribute('class')) { // If it has a class attribute firstItem.removeAttribute('class'); // Remove its class attribute}
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