register.js

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    var oRequest;
        
  var bXmlHttpSupport = (typeof XMLHttpRequest != "undefined" || window.ActiveXObject);
 
 if (typeof XMLHttpRequest == "undefined" && window.ActiveXObject) {
        function XMLHttpRequest() {
            var arrSignatures = ["MSXML2.XMLHTTP.5.0", "MSXML2.XMLHTTP.4.0",
                                 "MSXML2.XMLHTTP.3.0", "MSXML2.XMLHTTP",
                                 "Microsoft.XMLHTTP"];
                             
            for (var i=0; i < arrSignatures.length; i++) {
                try {        
                    var oRequest = new ActiveXObject(arrSignatures[i]);            
                    return oRequest;        
                } catch (oError) { /*ignore*/ }
            }          
    
            throw new Error("MSXML is not installed on your system.");               
        }
    }    
function checkForm(form){
	  
	    
	    
		if(isEmpty(form.username.value) || isEmpty(form.password.value) || isEmpty(form.confirmPassword.value) || isEmpty(form.email.value)  ){
			alert("请将必填项填写完整!");
			return false;
		}
		if(form.password.value!=form.confirmPassword.value){
			alert("两次密码不匹配!");
			return false;
		}
		if(form.password.value.length<6 || form.password.value.length>16){
			alert("密码长度不得少于6个字符，不得多于16个字符！");
			return false;
		}
		
		
		return true;
	}
	function isEmpty(str){
		if(str==null || str.length==0)
			return true;
		else 
			return false;
	}
	function checkName(){
	   if(bXmlHttpSupport) {
            var sUrl = 'check.do?username="knight"';
            var oRequest = new XMLHttpRequest();
            oRequest.onreadystatechange = function() {
                if(oRequest.readyState == 4) { 
                
                
                
              }           
          }         
       }                  
	}
	 function cb(result,exception){
	    if(result==null&&exception!=null){
	    alert(exception.message);
	    }
	    if(result!=null&&exception==null){
	    doucument.getElementById("isExist").innerHTML=result;
	    }
    }