javascript 如何判断传入的日期是否是昨天

Question

javascript 如何判断传入的日期是否是昨天。谢谢

Answer 1

算出昨天的这个时间，然后和需要测试的日期的年月日进行比较就可以啦：

var today = new Date();
var yesterday = new Date(now - 1000 * 60 * 60 * 24);
var test = new Date(2016, 9, 27);
if (yesterday.getYear() === test.getYear() && yesterday.getMonth() === test.getMonth() && yesterday.getDate() === test.getDate()) {
    console.log('是昨天');
} else {
    console.log('不是昨天');
}

Answer 2

moment.js 也有相关判断~

Answer 3

function isYestday(theDate){
    var date = (new Date());    //当前时间
    var today = new Date(date.getFullYear(), date.getMonth(), date.getDate()).getTime(); //今天凌晨
    var yestday = new Date(today - 24*3600*1000).getTime();
    return theDate.getTime() < today && yestday <= theDate.getTime();
}

isYestday(new Date());    //false
isYestday(new Date(new Date().getTime() - 24*3600*1000));    //true
isYestday(new Date(new Date().getTime() - 48*3600*1000));    //false