用于检查年龄的JavaScript [关闭]

Question

<<

“您的15岁以下儿童”。

Answer 1

var age = calcAge(dateString);

function calcAge(dateString) {
  var birthday = +new Date(dateString);
  return ~~((Date.now() - birthday) / (31557600000));
}

// TODO Extra is:
if (age >= 15)
{
   return true;
}
else
{
    alert('You are under 15');
    return false
}

FIDDLE DEMO

Answer 2

var today = new Date();
var birthDate = new Date(dateString);
var age = today.getFullYear() - birthDate.getFullYear();
var m = today.getMonth() - birthDate.getMonth();
if (m < 0 || (m === 0 && today.getDate() < birthDate.getDate())) {
    age--;
}
if(age < 15) {
    alert("You are under 15 age");
    return false;
}

Answer 3