Question

我这里有一个JavaScript数组。我需要将生日值与设定日期进行比较，并使用新的键值更新记录。

var employees = [
    {
        "internalid":"1", 
        "name":"Abe Anderson", 
        "email":"aanderson@javascript.com", 
        "birthdate":"9/25/1974", 
        "supervisor":"3", 
        "2012 Revenue":"100000.00", 
        "2013 Revenue":"0.00"
    }
];

我在这里写的很好，

for (var i = 0; i < employees.length; i++) {
    var cDate = new Date("2014/01/01");
    var newDate = cDate.getMonth()+1 + '/' + cDate.getDate() + '/' + cDate.getFullYear();
    var eBday = employees[i].birthdate;
}

我很难写出数学来正确地比较这两个日期。谁能帮我？我需要计算每个人在他或她的生日之前剩下的天数并更新JavaScript数组。我被卡住了！

Answer 1

我建议使用momentJS。它是去javascript日期处理的库。

在momentJS中，您可以使用moment.diff方法：http://momentjs.com/docs/#/displaying/difference/

var a = moment([2007, 0, 29]);
var b = moment([2007, 0, 28]);
a.diff(b, 'days') // 1

这家伙详细解答了如何使用momentJS进行比较：https://stackoverflow.com/a/22601120/6624456

Answer 2

试试这个。

var employees = [{
  "internalid": "1",
  "name": "Abe Anderson",
  "email": "aanderson@javascript.com",
  "birthdate": "9/25/1974",
  "supervisor": "3",
  "2012 Revenue": "100000.00",
  "2013 Revenue": "0.00"
}];

for (var i = 0; i < employees.length; i++) {
  employees[i].daysToBirthday = DaysToBirthdayFromToday(employees[i].birthdate);
}

console.log(employees);


function DaysToBirthdayFromToday(birthdayString) {
  "use strict";
  var currentYear = new Date().getFullYear();
  //get today midnight
  var today = new Date(currentYear, new Date().getMonth(), new Date().getDate());
  var birthdayParts = birthdayString.split("/");
  var yearBirthday = new Date(currentYear, birthdayParts[0] - 1, birthdayParts[1]);
  var timDiffInMilliSeconds = yearBirthday.getTime() - today.getTime();
  var timDiffInDays = timDiffInMilliSeconds / (1000 * 60 * 60 * 24);
  return timDiffInDays < 0 ? 0 : timDiffInDays; // set zero if past
}

从今天起生日多少天了

2 个答案: