js 网页时钟（自动补0）

[javascript]代码库

<div id="clock"></div>
<script>
	function changeClock() {
		var now = new Date();

		var year = now.getFullYear();
		var month = now.getMonth() + 1;
		var day = now.getDate();
		var hour = now.getHours();
		var minute = now.getMinutes();
		var second = now.getSeconds();

		// 补零
		if (month < 10) {
			month = "0" + month;
		}
		if (day < 10) {
			day = "0" + day;
		}
		if (hour < 10) {
			hour = "0" + hour;
		}
		if (minute < 10) {
			minute = "0" + minute;
		}
		if (second < 10) {
			second = "0" + second;
		}

		// 显示时钟
		document.getElementById("clock").innerHTML = year + "-" + month + "-"
				+ day + " " + hour + ":" + minute + ":" + second;
	}
	window.setInterval(changeClock, 1000);
</script>

[代码运行效果截图]