js时间类型相减

// 创建两个Date对象
const date1 = new Date('2023-10-01T12:00:00Z');
const date2 = new Date('2023-10-01T14:30:00Z');

// 计算时间差（毫秒）
const differenceInMs = date2 - date1;

// 将时间差转换为其他单位
const differenceInSeconds = differenceInMs / 1000;
const differenceInMinutes = differenceInMs / (1000 * 60);
const differenceInHours = differenceInMs / (1000 * 60 * 60);

console.log(`时间差（毫秒）: ${differenceInMs}`);
console.log(`时间差（秒）: ${differenceInSeconds}`);
console.log(`时间差（分钟）: ${differenceInMinutes}`);
console.log(`时间差（小时）: ${differenceInHours}`);

const date1 = new Date(Date.UTC(2023, 9, 1, 12, 0, 0)); // 注意月份从0开始计数
const date2 = new Date(Date.UTC(2023, 9, 1, 14, 30, 0));
const differenceInMs = date2 - date1;

const start = performance.now();
// 执行某些操作
const end = performance.now();
const differenceInMs = end - start;
console.log(`时间差（毫秒）: ${differenceInMs}`);