原生态Ajax无刷新评论和顶踩代码（记事本打造，无验证）

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 1 <br><script type="text/javascript"> 2 ? 3     var xhr=false; 4     var actionType; 5     //todo: 6     var sId=1; 7 　　function createXmlHttp() {//创建xhr对象 8             var xhobj = false; 9             try {10                 xhobj = new ActiveXObject("Msxml2.XMLHTTP"); // ie msxml3.0+11             } catch (e) {12                 try {13                     xhobj = new ActiveXObject("Microsoft.XMLHTTP"); //ie msxml2.614                 } catch (e2) {15                     xhobj = false;16                 }17             }18             if (!xhobj && typeof XMLHttpRequest != 'undefined') {// Firefox, Opera 8.0+, Safari19                 xhobj = new XMLHttpRequest();20             }21             return xhobj;22         }23     window.onload=function(){24         xhr=new createXmlHttp();25     }26     function doSupport(isSupport){27         xhr.open("POST","DoSupport.ashx",true);28         xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");29         xhr.onreadystatechange=watching;30         if(isSupport){31             actionType=1;32             xhr.send("sId="+sId+"&isSup="+actionType);33         }34         else{35             actionType=0;36             xhr.send("sId="+sId+"&isSup="+actionType);37         }   38     }39     function watching(){40         if（xhr.readyState>=4）{41             if(xhr.status==200){42                 var resText=xhr.responseText;43                 var resArr=resText.split(",");44                 if(resArr[0]=="ok"){45                     if(actionType==1){46                         document.getElementById("spanSup").innerHtml=resArr[1];47                     }48                     else{49                         document.getElementById("spanDisSup").innerHtml=resArr[1];50                     }51                 }52                 else{53                     //todo:54                 }   55             }   56         }57     }58     function AddComment(){59         xhr.open("POST","DoAddComments.ashx",true);60         xhr.setreadystatechange=watchingComments;61         xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");62         var urlData="sId"+sId+"&txtContents="+document.getElementByIdea("txtComments").value;63         xhr.send(urlData);64     }65     function watchingComments(){66         if(xhr.readyStates>=4){67             if(xhr.status==200){68                 var resText=xhr.responseText;69                 if(resText=="ok"){70                     var commentsTable=document.getElementById("txtComments");//获取评论的表格对象71                     var newRow=commentsTable.insertRow(commentsTable.row.length);72                     var nTd1=newRow.insertCell();73                     var nTd2=newRow.insertCell();74                     nTd1.innerHtml=nowLoginUser;75                     nTd2.innerHtml=document.getElementById("txtComments").value;76                 }77                 else{78                     //todo:79                 }80             }81             else{82                 alert(xhr.status);83             }84         }85          86     }87  88  89  90 <script>