一部分
		var rand = parseInt(Math.random() * 1000);
		var t = (new Date()).getTime();
		clientid =rand+'T'+t;
		
		setCookie("HUAYIUPLOAD",clientid,365);
	}
	
	var info = clientid;
	if (file.lastModified)
		info += file.lastModified;
	if (file.name)
		info += file.name;
	if (file.size)
		info += file.size;
	//https://cdn.bootcss.com/blueimp-md5/2.10.0/js/md5.min.js
	var fileid = md5(info);
	return fileid;
}

//禁止浏览器打开文件的默认行为
document.addEventListener("drop",function(e){  //拖