Object-Oriented JavaScript: Using the `Prototype` Property 从JavaScript 1.1开始，它就有了一个内置对象叫Prototype。通过它，可以扩展JavaScript，在对象上编写自定义的属性和方法。举个例子来说。下面自定义了一个叫myTrim的方法，并展示了它的用法。
<script> <BR>String.prototype.myTrim = function(){ <BR>return( this.replace(new RegExp("^([\\s]+)|([\\s]+)$", "gm"), "") ); <BR>} <BR>document.getElementById("textbox").value = " This A Book ".myTrim (); <BR></script>
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