要以小写大写字母设置字体，请使用 fontVariant属性。
您可以尝试运行以下代码来设置要使用JavaScript以小写大写字母显示的字体-
<!DOCTYPE html>
<html>
<body>
<h1>Heading 1</h1>
<p id="myID">
This is Demo Text. This is Demo Text. This is Demo Text. This is Demo Text.
This is Demo Text. This is Demo Text. This is Demo Text. This is Demo Text.
</p>
<button type="button" onclick="display()">Set Font Family and Font Variant</button>
<script>
function display() {
document.getElementById("myID").style.fontFamily = "verdana,sans-serif";
document.getElementById("myID").style.fontVariant = "small-caps";
}
</script>
</body>
</html>