要以秒为单位转换时间，首先要获取当前时间。然后，将小时数乘以3600，将分钟数乘以60；其余你可以在下面看到-
(hours*3600) + (min*60) + sec
您可以尝试运行以下代码以秒为单位获取当前时间-
<html>
<head>
<title>JavaScript Get Seconds</title>
</head>
<body>
<script>
var dt = new Date();
var sec = dt.getSeconds();
document.write("Seconds: " + sec);
var min = dt.getMinutes();
document.write("<br>Minutes: " + min);
var hrs = dt.getHours();
document.write("<br>Hours: " + hrs);
var total_seconds = (hrs*3600) + (min*60) + sec;
document.write("<br>Total seconds: " + total_seconds) ;
</script>
</body>
</html>输出结果
Seconds: 35 Minutes: 37 Hours: 9 Total seconds: 34655