AJAX，为什么readyState一直是0？

[玫_瑰骑_士]

Send方法：

function AjaxRequest() 
{
  //......
}

// Send an Ajax request to the server
AjaxRequest.prototype.send = function(type, url, handler, postDataType, postData) 
{
  if (this.request != null) 
  {
    // Kill the previous request
    this.request.abort();

    // Tack on a dummy parameter to override browser caching
    url += "?dummy=" + new Date().getTime();

    try 
	{
      this.request.onreadystatechange = handler;
      this.request.open(type, url, true); // always asynchronous (true)
	  
      if (type.toLowerCase() == "get") 
	  {
        // Send a GET request; no data involved
        this.request.send(null);
      } 
	  else 
	  {
        // Send a POST request; the last argument is data
        this.request.setRequestHeader("Content-Type", postDataType);
        this.request.send(postData);
      }
    } 
	catch(e) 
	{
      alert("Ajax error communicating with the server.\n" + "Details: " + e);
    }
  }
}

按下按钮触发：

        document.getElementById("PcButton").onclick = function()
	{
		//1.最后的检测
		var isQualified = false;
		
		//检测过程
		isQualified = validate();
		
		//2.输送数据
		if(isQualified == true)
		{
			var account = document.getElementById("Account").value;
			var password = document.getElementById("Password").value;
			
			user = new User(account,password);
			
			ajaxReq = new AjaxRequest();
			var postData = user.account + "&" + user.password;
			ajaxReq.send("POST","Default.aspx",changeHandler,"application/x-www-form-urlencoded;charset=UTF-8",postData);
		}
	}

为什么会一直是0？还不说send，连open都没触发？

[rainsilence]

把this.request.abort();去掉试试

[玫_瑰骑_士]

引用 1 楼 rainsilence 的回复:

把this.request.abort();去掉试试

也不行= =

[rainsilence]

不管是get还是post再加上 this.request.setRequestHeader("Content-Type", “application/x-www-form-urlencoded;charset=utf-8”);

[rainsilence]

changeHandler是怎么写的？ 返回0说明没有正确的调用send.

[玫_瑰骑_士]

引用 4 楼 rainsilence 的回复:

changeHandler是怎么写的？ 返回0说明没有正确的调用send.

还啥都没写 function changeHandler() {}

[xuzuning]

看看 AjaxRequest 的定义