■スクリプト
<HTML> <HEAD> <TITLE>prototype</TITLE> </HEAD> <BODY bgColor="white"> <CENTER> <H1>プロパティの追加</H1> </CENTER> <SCRIPT Language="JavaScript"> <!-- Object.prototype.OpenSpace = "OpenSpace"; theObj = new Object(); document.write(theObj.OpenSpace); // --> </SCRIPT> </BODY> </HTML>