如果我设置与给定查询字符串参数相关的日期，我怎样才能获得一周中的正确日期？

Question

我在设置一周中的正确日期时遇到一些麻烦，我正在使用与日历相关的查询字符串参数，并且我想将所选日期用于另一个很好的脚本，除了我无法设置正确的一天。查询字符串参数采用以下格式：dd / mm / yyyy，并且在给定此数据的情况下，我也试图获得正确的日期。

    this.f = new Date();

    this.f.setDate = getUrlParameter('date').split("/")[0];
    this.f.setMonth = getUrlParameter('date').split("/")[1];
    this.f.setFullYear = getUrlParameter('date').split("/")[2];
    console.log(this.setMonth);

    this.days = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
    this.months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
    console.log(this.months[this.setMonth]);

Answer 1

您正在将日期对象的方法视为数据属性。您需要将它们称为方法，例如

function getUrlParameter() {
  return '12/04/2019';
}

// Replace this with plain obj
var obj = {};

obj.f = new Date();

// Call methods, don't assign to properties
// The set* methods set values
obj.f.setDate(getUrlParameter('date').split("/")[0]);

// Subtract 1 from calendar month number as EMCScript months are zero based, April is 3
obj.f.setMonth(getUrlParameter('date').split("/")[1] - 1);
obj.f.setFullYear(getUrlParameter('date').split("/")[2]);

// The get* methods get values
// Use getMonth to get the month
console.log(obj.f.getMonth());

obj.days = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
obj.months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

console.log(obj.months[obj.f.getMonth()]);

但是，一次设置一个属性可能会引入错误，例如如果月份是在4月份创建的，并且您尝试将日期设置为5月31日，那么当日期设置为31时，它将变为5月1日（因为没有4月31日）所以您最终会得到5月1日的日期不是5月31日。所以一次性设置所有值：

let obj = {f: new Date()};
// Get date parta
let [day, month, year] = '31/05/2019'.split('/');

// Set values in one go
obj.f.setFullYear(year, month - 1, day);

console.log(obj.f.toLocaleDateString());

// But better to create the date with the right values
// from the start
let [day2, month2, year2] = '31/05/2019'.split('/');
let obj2 = {f: new Date(year2, month2 - 1, day2)};

console.log(obj2.f.toLocaleDateString());