5)构造函数的用法: 例 3.5.1 <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"/> </head> <script> function Student(name, age) { /* 马克-to-win:later on we can use it in var doc = new ActiveXObject( "Microsoft.XMLDOM" ); doc.async="false"; doc.load(str); when a property has a this, means that this property is a member property. */ = name; this.age = age; this.parti = function() { document.writeln("名字是:" + + "<br>"); document.writeln("年纪是:" + this.age + "<br>"); }; } var p = new Student('jeri', 3); document.writeln("typeof p is " + typeof(p)); //typeof(p) is object p.parti(); p.age = 4; p.parti(); /*the following two methods can also access some properties.*/ document.writeln("" + p["age"]); document.writeln("" + p["a" + "ge"]); if (p instanceof Student) document.writeln("p是Student的实例<br>"); /*javascript 中的对象全部是Object 的子类 Because this object is the topmost parent object in the prototype inheritance hierarchy, all other object classes inherit its methods and properties. It's a close enough call that JavaScript 2.0 may well move it into the class-based object-oriented category at which time the prototype inheritance would be replaced with super-class/sub-class mechanisms and the arguments become null and void. */ /*When the Global object is created, it always has at least the following properties: Object object Function object Array object String object Boolean object Number object Date object Math object Value properties */ if (p instanceof Object) document.writeln("p是Object的实例"); </script>





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