javaScrpit在表面上显示时间

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<!DOCTYPE html><html>  <head>    <title>showtime.html</title>    <script type="text/javascript">function showTime() {var div1 = document.getElementById("div1");var d = new Date();var y = d.getFullYear();var m = d.getMonth() + 1;var day = d.getDate();var h = d.getHours();var mm = d.getMinutes();var s = d.getSeconds();var time =y+"-"+m+"-"+day+" "+h+":"+mm+":"+s;div1.innerHTML = time+"<br />";setTimeout(showTime, 1000);}window.onload = showTime;</script>  </head>    <body>    <div id="div1"></div>  </body></html>