W3School TIY Editor
W3School 在线教程
改变方向
暗黑模式
运行代码
<html> <body> <script type="text/javascript"> Function.prototype.originalToString = Function.prototype.toString; Function.prototype.toString = function() { if (this.originalToString().length > 100) { return "Function too long to display."; } else { return this.originalToString(); } }; function sayHi() { alert("hi"); } document.write(sayHi.toString()); </script> </body> </html>