为fileid，后面追加t参数是避免浏览器缓存
	var url = resume_info_url + '?fileid='+fileid + '&t='+t;
	
	var ajax = new XMLHttpRequest();
	
	ajax.onerror = function (e) {
		if (window.reconnectId) 
			return;
		window.reconnectId = window.setTimeout(function() {
			doupload(true);
		},2000);
	};
	
	ajax.onreadystatechange = function () {
		
		if(this.readyState == 4){
			if (bReconnect) {
				//目前是重连状态，清除重连标志
				window.reconnectId = 0;
			}
		
			if (this.status == 2