html运行实例（eg_js_number_nan_typeof）-搜寻教程库

代码示例：（标识：eg_js_number_nan_typeof）

<!DOCTYPE html>
<html>
<body>

<h1>JavaScript 数字</h1>

<p>NaN 是数，typeof NaN 返回 number：</p>

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

<script>
var x = NaN;
document.getElementById("demo").innerHTML = typeof x;
</script>

</body>
</html>