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copied!<p>it's about class extend ( but javascript doesn't have real 'class' ).you may use <code>Prototype.js</code> or <code>mootool.js</code> or do like this?</p> <pre><code>function Human () { this.init.apply ( this, arguments ); } Human.prototype = { init: function () { var optns = arguments[0] || {}; this.age = optns.age || 0; this.name = optns.name || "nameless"; }, getName : function () { return this.name; }, getAge : function () { return this.age; } } function Man () { this.init.apply ( this, arguments ); } Man.prototype = { init : function () { Human.prototype.init.apply (this, arguments); this.sex = "man"; }, getName : Human.prototype.getName, getAge : Human.prototype.getAge, getSex : function () { return this.sex; } } function Woman () { this.init.apply ( this, arguments ); } Woman.prototype = { init : function () { Human.prototype.init.apply (this, arguments); this.sex = "woman"; }, getName : Human.prototype.getName, getAge : Human.prototype.getAge, getSex : Man.prototype.getSex } var human = new Human({age:60,name:"Tom Tomas"}), man1 = new Man({age:30,name:"Wood Tomas"}), woman1 = new Woman({age:19,name:"Mary Tomas"}); console.log( human.getName() ); console.log( man1.getName() ); console.log( woman1.getName() ); console.log( human.getAge() ); console.log( man1.getAge() ); console.log( woman1.getAge() ); console.log( human.getSex && human.getSex() ); console.log( man1.getSex() ); console.log( woman1.getSex() ); </code></pre> <p>or you could use jQuery's $.extend to do this. wish can help !</p>

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