html运行实例（eg_js_datatypes_typeof

代码示例：（标识：eg_js_datatypes_typeof_string）

<!DOCTYPE html>
<html>
<body>

<h2>JavaScript typeof</h2>

<p>typeof 运算符返回变量或表达式的类型：</p>

<p id="demo"></p>

<script>
document.getElementById("demo").innerHTML = 
typeof "" + "<br>" +
typeof "Bill" + "<br>" + 
typeof "Bill Gates";
</script>
</body>
</html>