菜鸟教程在线编辑器

 
                <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>

<p>点击按钮返回一个函数，该函数是创建对象的原型。 </p>

<button onclick="myFunction()">点我</button>

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

<script>
function myFunction() {
    var patt = new RegExp("RUNOOB", "g");
    var res = patt.constructor;
    document.getElementById("demo").innerHTML = res;
}
</script>

</body>
</html>
              