<!DOCTYPE html>
<html>
<body>
<h1>JavaScript</h1>
<p>空字符串既有合法值又有类型：</p>
<p id="demo"></p>
<script>
let car = "";
document.getElementById("demo").innerHTML =
"The value is: " +
car + "<br>" +
"The type is: " + typeof car;
</script>
</body>
</html>