JavaScript 中的类方法，对象方法，Prototype方法

 <script type="text/javascript">
  function baseClass()
 {
     this.showMsg = function()
     {
         alert("baseClass::showMsg");
     }

     this.baseShowMsg = function()
     {
         alert("baseClass::baseShowMsg");
     }
 }
 baseClass.showMsg = function()
 {
     alert("baseClass::showMsg static");
 }

 function extendClass()
 {
     this.showMsg =function ()
     {
         alert("extendClass::showMsg");
     }
 }
 extendClass.showMsg = function()
 {
     alert("extendClass::showMsg static")
 }

 extendClass.prototype = new baseClass();
 var instance = new extendClass();

 instance.showMsg(); //显示extendClass::showMsg
 instance.baseShowMsg(); //显示baseClass::baseShowMsg
 instance.showMsg(); //显示extendClass::showMsg

 baseClass.showMsg.call(instance);//显示baseClass::showMsg static

 var baseinstance = new baseClass();
 baseinstance.showMsg.call(instance);//显示baseClass::showMsg
 </script>