异步请求项目中的一点理解

var request = YAHOO.util.Connect.asyncRequest("POST",sUrl,callback, postData);
var sUrl= PORTAL.constant.CONTEXT_PATH +"/views/masterData/vendor/vendorMaintenanceAction!getVendorDetail.action";
定义页面上所要获取的参数
var id = document.getElementById("Pid").value;
var no = document.getElementById("vendorNo").value;
var name = document.getElementById("vendorname").value;
var canBeConsumed = document.getElementById("canBeConsumed").checked;
var canBeReceived = document.getElementById("canBeReceived").checked;
var desc = document.getElementById("desc").value;
var sUrl= PORTAL.constant.CONTEXT_PATH +"/views/masterData/vendor/vendorMaintenanceAction!doSave.action";
var postData="Pid="+id+"&vendorNo="+no+"&vendorname="+name+"&canBeConsumed="+canBeConsumed+"&canBeReceived="+canBeReceived+"&desc="+desc;

reques是在后台HttpServletRequest
request=ServletActionContext.getRequest(); 来接受
post是向后台传递的一种方式， sUrl 是页面要要后台调用的请求方法
callback是回滚 在页面显示打印消息
postData是页面中向后台传递所带的参数。