周／星期 转 日期 markdown

school_week_to_date.js

function getDateOfISOWeek(y,w,i) {
    var simple = new Date(y, 0, 1 + (w - 1) * 7+i);
    var dow = simple.getDay();
    var ISOweekStart = simple;
    if (dow <= 4)
        ISOweekStart.setDate(simple.getDate() - simple.getDay() + 1);
    else
        ISOweekStart.setDate(simple.getDate() + 8 - simple.getDay());
    return ISOweekStart;
}

function weekDate(y,w,i) {
    let d = 1 + (w - 1) * 7+i;
    //console.log(d);
    var simple = new Date(y, 0, d);
    return simple;
}

let c = {};
for(let w=0;w<19;w++){
	let days = [];
	for(let i=1;i<=5;i++){
		let week = w+36;
		let z = weekDate(2017,week, i);
        let m = z.getMonth()+1;
        let d = z.getDate();
		days.push(`${m}`.padStart(2)+`-${d}`.padEnd(2));
	}
	c[w+2] = days;
}


console.log(`| 周 | 星期一| 星期二| 星期三| 星期四| 星期五|`);
console.log(`| :--|:--| :--|:--|:--|:--|`);
for(let w in c){
    let days = c[w];
    console.log(`|${w}|${days[0]}|${days[1]}|${days[2]}|${days[3]}|${days[4]}|`);
}