使用带有 Javascript 动态变量的变量的 if 语句答案

【问题标题】：Use if statement with variables that are dynamic variables with Javascript使用带有 Javascript 动态变量的变量的 if 语句
【发布时间】：2019-09-21 14:39:40
【问题描述】：

基本上，我正在尝试使用最后的信息 (mm/dd) 创建生日验证器，但它没有按预期返回值


var today = new Date();
var dd = String(today.getDate()).padStart(2, '0');
var mm = String(today.getMonth() + 1).padStart(2, '0');
today = mm + '/' + dd;
var newday = today.toString();


var birthday = "1992/09/21";
var monthday = birthday.substr(birthday.length - 5);


function validator(newday, birthday) {
    if (monthday === newday) {
        console.log('True');
        return true;
    }
    else {
        console.log('False');
        return false
    }
}
validator();
console.log(newday, monthday)

【问题讨论】：

标签： javascript node.js date validation if-statement

【解决方案1】：

你可以试试这个

var today = new Date();
var dd = String(today.getDate()).padStart(2, '0');
var mm = String(today.getMonth() + 1).padStart(2, '0');
today = mm + '/' + dd;
var newday = today.toString();
console.log('New Date is', newday)


var birthday = "1992/09/21";
var monthday = birthday.substr(birthday.length - 5);
console.log('Month day', monthday)


function validator(newday, birthday) {
    if (newday === birthday) {
        console.log('True');
        return true;
    }
    else {
        console.log('False');
        return false
    }
}
validator(newday, monthday);
//console.log(newday, monthday)

【讨论】：

【解决方案2】：

momentjs 是一个轻量级的 javascript 库，用于验证、操作和格式化日期。

它提供包装器来获取月、年和日期。

var date = new Date();
//Get todays Day and month in "DD/MM" format
var newday = moment(date, 'YYYY/DD/MM').format('DD/MM');
console.log("newDay: " + newday);


//Get birthdate Day and month in "DD/MM" format
var birthday = moment("1992/09/21", 'YYYY/MM/DD').format('DD/MM');
console.log("birthday: " + birthday);

function validator(newday, birthday) {
    if (newday === birthday) {
        console.log('True');
        return true;
    }
    else {
        console.log('False');
        return false
    }
}
validator(newday, birthday);

&lt;script src="https://momentjs.com/downloads/moment.js"&gt;&lt;/script&gt;

更多详情可以访问moment.js page

【讨论】：