1.什么叫dwr ? 

        engine.js  和  util.js

      *调用过程: 当服务器端得DwrServlet接收到来自客户端的异步请求后会根据请求信息去调用
      *         此类中的service(方法在配置文件中配置)方法,当service方法处理完业务逻辑后
      *         会将结果交给DwrServlet,并由他将结果(xml)放置到response中返回给客户端
      1. dwr.xml:
<create javascript="service" creator="new">
<param name="class" value="service.Service">
<!-- 跨域访问 -->

         <script type="text/javascript" src="../dwr/interface/check.js"></script>
         <script type="text/javascript" src="../../js/checkName.js"></script>
  <script type="text/javascript" src="../../dwr/engine.js"></script>
         <script type="text/javascript" src="../../dwr/util.js"></script>

    注意:步骤4中check.js   与dwr.xml 中创建的js对象名字必须相同

     java                         JavaScript
     基本数据类型/              Basic Converter       Number
     包装类型            ---------------------------> Boolean
     String                                            String
     java.sql.Date                    Date  Converter
     java.util.Date          --------------------------->      Date

                         Array  Convertier                    
     数组           -------------------->                 Array
                          Collection  Convertier  
     Collection          ------------------------>      Array

                           Collection  Convertier 
     Map           ------------------------------>       Object
     POJO             Bean/Object Converter(需要配置)
     Bean 类         ------------------------------->     Object
     <convert match="service.Message" converter="Bean">
    8.utilliy  function:(工具函数)
      1.$()      获得圣属性:  $("input")
      2.getValue(),getValues(),getValue(),setValue()   获得某个属性值: DWRUtil.getValue("content");
      3.addRows  .removeAllRows()                     对表格添加一行: DWRUtil.addRows(); 见程序
      4.addOptions  removeAllOptions                  对下拉框添加选择框options: DWRUtil.addOptions(数组);
    9.engiine function: 

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