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<!DOCTYPE html> <html> <body> <h2>JavaScript HTML DOM</h2> <p>Hello World!</p> <p>Hello Norway!</p> <p>单击该按钮可更改所有 p 元素的颜色。</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { var myCollection = document.getElementsByTagName("p"); var i; for (i = 0; i < myCollection.length; i++) { myCollection[i].style.color = "red"; } } </script> </body> </html>