Javascript中的每個對象(object)都會有 prototype 。試一下：

復制代碼 代碼如下:

var Richard = new Object();
alert(typeof(Richard.prototype));

復制代碼 代碼如下:

function Richard(){}
alert(typeof(Richard.prototype));

復制代碼 代碼如下:

var Richard = new Object();
alert(Richard.__proto__);