​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1 id="myH1">Element 对象</h1>
​
<h2>style 属性</h2>
​
<p id="myP">单击“更改”为我添加红色的背景颜色。</p>
​
<button onclick="myFunction()">更改</button>
​
<script>
function myFunction() {
  document.getElementById("myP").style.backgroundColor = "red";
}
</script>
​
</body>
</html>
​