js实时监听用户输入

在用户输入后1秒后执行操作。（请求服务器实现自动补全 或者别的操作）

主要不想每当用户有输入就向服务器提交请求。

<script>
	

		 //request the server to get data
		 function logs(){
			$('#lable').text($('#t').val());
			};
		$(function(){
		
			var time= (new Date()).getTime();
			var req = setTimeout("logs()",1000);

			$('#t').keyup(function(){
				var t = (new Date()).getTime();
				var _t = time;
				time= (new Date()).getTime();
				//if the time during 2 keyup is less than 1s, concel the last request.		
				if(t-_t <1000)
				{
					clearTimeout(req);			
				}
				// send a request
				req = setTimeout("logs()",1000);
			})
		})
	</script>