var  rootMenu = new  Ext.tree.TreeNode({

        text: " 示例中心 " ,

        expanded: true

    });

Ext.MessageBox.show({

            title: " 消息提示区内容 " ,

            msg:hArea.dom.innerHTML,

            width: 200 ,

            buttons:Ext.MessageBox.OK,

            animEl:hArea

        });

< script type = " text/javascript " >

   <!--

   // 普通方法

   function  commonArg(name,age,desc){

     var  userinfo = " name:  " + name + " , " + " age:  " + age + " \ndescription:  " + desc;

    alert(userinfo);

  }

  commonArg( " yemoo " , 22 , " a boy! " ) // 每次调用都必须按照规定的参数顺序书写，如果写成commonArg(22,"yemoo","desc")则返回信息就不对，每次都必须记忆每个参数意义及顺序

  

   // JSON参数法

   function  jsonArg(info){

     var  userinfo = " name:  " + info.name + " \tage:  " + info.age + " \ndescription:  " + info.desc;

    alert(userinfo);

  }

  jsonArg({name: " blue " ,age: 22 ,desc: " a gril? " });

  jsonArg({desc: " not a people! " ,name: " sss " ,age: 0 });

   // 参数位置可以随意写

   // -->

   </ script >

< script type = " text/javascript " >

   <!--

   // 普通方法

   function  commonArg(name,age,desc){

     var  userinfo = " name:  " + (name || " empty " ) + " \tage:  " + (age || 0 ) + " \ndescription:  " + desc || " empty " ;

    alert(userinfo);

  }

   // 当只需要设定后面的参数时前面每个参数都需要设置为null

  commonArg( " tempUser " );

  commonArg( null , null , " a boy! " );

  commonArg( null , 20 );

  

   // JSON参数法

   function  jsonArg(info){

     var  userinfo = " name:  " + (info.name || " empty " ) + " \tage:  " + (info.age || 0 ) + " \ndescription:  " + (info.desc || " empty " );

    alert(userinfo);

  }

   // 每次只需要设置需要设定参数项

  jsonArg({name: " tempUser " });

  jsonArg({desc: " a boy! " });

  jsonArg({age: 20 });

   // -->

   </ script >