根据出生日计算年龄

/*
 * 根据出生日计算年龄
*/
function ages(str){
    var   r   =   str.match(/^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2})$/);     
    if(r == null) return   false;     
    var d = new Date(r[1],r[3]-1, r[4]);     
    if(d.getFullYear()==r[1]&&(d.getMonth()+1)==r[3]&&d.getDate()==r[4]){   
      	var Y = new Date().getFullYear();   
      	return((Y-r[1]));   
    }   
    return("输入的日期格式错误！");   
}   
console.log(ages("1993-12-18"));   
console.log(ages("2002-01-41"));