在javascript中设置上页边距日历

var calendar = new Date();

calendar.setDate(0);

var lastDayOfLastMonth = new Date(calendar.getFullYear(), calendar.getMonth() + 1, 0);

var firstDayOfLastMonth = new Date(lastDayOfLastMonth.getFullYear(), lastDayOfLastMonth.getMonth(), 1);
var dayOfWeek = firstDayOfLastMonth.getDay();

var calendarElement = document.getElementById("calendar"); // 假设日历的HTML元素的id为"calendar"
calendarElement.style.marginTop = dayOfWeek * 20 + "px"; // 设置上页边距为星期几乘以20像素