js根据日期计算年龄

代码:

var birthday=new Date("1989-06-25".replace(/-/g, "\/")); 
var d=new Date(); 
var age = d.getFullYear()-birthday.getFullYear()-((d.getMonth()<birthday.getMonth()|| d.getMonth()==birthday.getMonth() && d.getDate()<birthday.getDate())?1:0);