html运行实例（jseg_pro_js_object_modifying

代码示例：（标识：jseg_pro_js_object_modifying_5）

<html>
<body>

<script type="text/javascript">

Function.prototype.toString = function() {
  return "Function code hidden";
}

function sayHi() {
  alert("hi");
}

document.write(sayHi.toString());

</script>

</body>
</html>