JavaScript更改P元素的样式： 1.<html> 2.<body> 3.<p id="p2">Hello World!> 4.<script> 5.document.getElementById("p2").style.color = "red"; 6.</script> 7.<p>The paragraph above was changed by a script.</p> 8.</body> 9.</html> 单击按钮时，此示例更改id="id1"元素的样式： 1.<!DOCTYPE html> 2.<html> 3.<body> 4.My Heading 1 5.<button type="button" 6.onclick="document.getElementById('id1').style.color = 'blue'"> 7.点击我!> 8.</body> 9.</html>