发送请求以及回调函数

熟能生巧的道理用在写代码上是非常贴切的..

第一个例子:

这里是js的写法

$(document).ready(function(){
	$("#masterusername").bind("blur",function(){
	var masterName=$("#masterusername").val();
	if(masterName!=""){
		$.post("/communityweb/AjaxAllServlet?change=CheckMasterName&masterName="+$("#masterusername").val(),
			   {},
			   function(data){
			   	var check=data.check;
			   	if(check==0){
			   		$("#masterusername").val("");
			   		$("#masteruserid").val("");
			   	}else if(check==1){
			   		$("#masterusername").val(masterName);
			   		$("#masteruserid").val(data.userid);
			   	}
			   },"json");
	}
	});
});

	
if(change.equals("CheckMasterName")){		
                        String userid="";
			
			String masterName=request.getParameter("masterName");
			AddXiaoQu xq=new AddXiaoQu();
			Resultobj rs=xq.getMaster(masterName);
			if(rs.getRows()>1){
				userid=rs.getCell("userid", 1);
			}
			if(!userid.isEmpty()){
				outStr="{check:'1',userid:'"+userid+"'}";
			}else{
				outStr="{check:'0'}";
			}
			out.print(outStr);
			out.close();
		}