ajax与php的应用？

答案：一样的用 function ajax(){      this.method;      this.url;      this.responsetype;      this.content;      var http_request = false;      this.getExecObj = function(reValue){             if(window.XMLHttpRequest) {                  http_request = new XMLHttpRequest();                  if (http_request.overrideMimeType) {                           http_request.overrideMimeType("text/xml");                  }            }            else if (window.ActiveXObject) {                  try {                           http_request = new ActiveXObject("Msxml2.XMLHTTP");                  } catch (e) {                           try {                                      http_request = new ActiveXObject("Microsoft.XMLHTTP");                           } catch (e) {}                  }            }            if (!http_request) {                  window.alert("创建XMLHttpRequest对象实例失败.");                  return false;            }                        if(this.method.toLowerCase()=="get") {                  http_request.open(this.method, this.url, true);            }            else if(this.method.toLowerCase()=="post") {                  http_request.open(this.method, this.url, true);                  http_request.setRequestHeader("Content-Type","application/x-www-form-urlencoded");            }            else {                                             window.alert("http请求类别参数错误。");                  return false;            }            http_request.send(this.content);                                    var reTextResponse = function() {                  if (http_request.readyState == 4) {                        if (http_request.status == 200) {                                       reValue(http_request.responseText);                                                                  } else {                                 alert("页面有异常。");                        }                  }            }                        var reXMLResponse = function() {                  if (http_request.readyState == 4) {                        if (http_request.status == 200) {                                       reValue(http_request.responseXML);                                                                  } else {                                 alert("页面有异常。");                        }                  }            }                         if(this.responsetype.toLowerCase()=="text") {                      http_request.onreadystatechange = reTextResponse;            }            else if(this.responsetype.toLowerCase()=="xml") {                  http_request.onreadystatechange = reXMLResponse;            }            else {                  window.alert("参数错误。");                  return false;            }      }       }              // 调用方法      var _ajax = new ajax()_ajax.method = "post";                                 //是get还是post_ajax.url = " http://www.pb4schools.net/Returnlist.aspx";                         //请求的地址_ajax.responsetype = "text";                           //处理返回内容的类型_ajax.content = "id=2";                                //发送的内容_ajax.getExecObj(                                      //对返回值处理       function(str){                        document.getElementById("select1").outerHTML = "选择大产品"+ str + ""                              });
这个是一个ajax   脚本类  自己看一下 很简单的 可以配合PHP用

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