const stamp1 = new Date(new Date().setHours(-24, 0, 0, 0)); //获取昨天零点的时间
document.write("<br>"+stamp1);
const stamp2 = new Date(new Date().setHours(0, 0, 0, 0) + 24 * 60 * 60 * 1000 - 1); //获取当天23:59:59的时间
document.write("<br>"+stamp2);