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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Date/getSeconds below:

Date.prototype.getSeconds() - JavaScript | MDN

Date.prototype.getSeconds()

Baseline Widely available

getSeconds() 方法根据本地时间，返回一个指定的日期对象的秒数。

尝试一下 
const moonLanding = new Date("July 20, 69 00:20:18");

console.log(moonLanding.getSeconds());
// Expected output: 18
语法 参数

无

描述

该方法返回一个 0 到 59 的整数值。

示例 示例：使用getSeconds 方法

下面第二条语句，基于日期对象 Xmas95 的值，把 30 赋值给变量 secs。

var Xmas95 = new Date("December 25, 1995 23:15:30");
var secs = Xmas95.getSeconds();
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