Js小数取整三种方法

				var f1 = 1.12
				var f2 = 1.82
				//ceil 是向上取整
				alert( Math.ceil(f1)); //2 
				alert( Math.ceil(f2)); //2
				//floor 是向下取整
				alert( Math.floor(f1)); //1
				alert( Math.floor(f2)); //1
				//round 是四舍五入
				alert( Math.round(f1)); //1
				alert( Math.round(f2)); //2