js demo 计算本年度还剩下多少天

 

//下面是一个例子，计算本年度还剩下多少天

function leftDays() {

var today = new Date();

var endYear = new Date(today.getFullYear(),11,31,23,59,999);

var msPerDay = 24 * 60 * 60 * 1000;

return Math.round((endYear.getTime() - today.getTime()) / msPerDay);

}

console.log(leftDays());