var http_request = false;
    var ret;
    // 初始化、指定处理函数、发送请求的函数
    function send_request(url) {
	    http_request = false;
	    // 开始初始化 XMLHttpRequest 对象
	    if(window.XMLHttpRequest) {				// Mozilla 浏览器
		    http_request = new XMLHttpRequest();
		    if(http_request.overrideMimeType) {	// 设置 Mime 类别
			    http_request.overrideMimeType("text/xml");
		    }
	    }else if(window.ActiveXObject) {	// IE　浏览器
		    try {
			    http_request = new ActiveXObject("Msxml2.XMLHTTP");
		    }catch(e) {
			    try {
				    http_request = new ActiveXObject("Microsoft.XMLHTTP");
			    }catch(e) {				
			    }
		    }
	    }	// end of if(window.XMLHttpRequest) {	

	    if(!http_request) {	// 异常，创建对象失败
		    alert("不能创建XMLHttpRequest对象实例.");
		    return false;
	    }
    	
	    http_request.onreadystatechange = processRequest;

	    http_request.open("GET", url, false);
	    http_request.send(null);

    }

    // 处理返回信息的函数
    function processRequest() {
	    if(http_request.readyState == 4) {
		    if(http_request.status == 200) {
			    ret = http_request.responseText;
			    //alert(retProd);
		    }else {
			    alert("暂时获取不到数据，请稍后再试！");
		    }
	    }
    }

    function ajaxjs(url)
    {
	send_request(url);
        return ret;
    }