為什么我的代碼不能正確比較日期？

我想檢查日期是否在范圍內。我創建了兩個函式，第一個 func 將型別 str 轉換為 Date，第二個 func 必須找到結果。

let probeArray = [{price: 123, date: '2021-11-27'}, 
{price: 13, date: '2021-11-15'}, 
{price: 1, date: '2021-10-2'}, 
{price: 17, date: '2021-10-1'}];


let startDate = '2021-10-1';
let endDate = '2021-10-20';

// transform str to Date
const toDate = (dateStr) => {
    const [year,month,day] = dateStr.split("-");
    // console.log('check date')
    // console.log([day, month, year])
    return new Date(year, month - 1,  day 1);
  }


function get_staticstic(probeAr, start, end){
    
    let result = null;
    let maxDate = toDate(start);
    let minDate = toDate(end);

    for (let tempEvent of probeAr){
        let currentDate = toDate(tempEvent.date);
        console.log('maxDate', maxDate);
        console.log('minDate', minDate);
        console.log('currentDate',currentDate);

    
        if (currentDate >= minDate && currentDate <= maxDate ){
             console.log('Correct Date');
        }
        else{
            console.log('Out Side range!!');
        }
    

    }
    return result
}
get_staticstic(probeArray, startDate, endDate);

但是所有日期的開始結果都是“超出范圍！！”。

uj5u.com熱心網友回復：

代碼問題

• toDate功能錯誤。定義應該是return new Date(year, month - 1, day);。無需在日期上加 1。此外，年份和日期不是強制性的，它們也可以是字串。
• minDate和maxDate里面的錯誤 get_staticstic。

作業小提琴

let probeArray = [
  { price: 123, date: '2021-11-27' },
  { price: 13, date: '2021-11-15' },
  { price: 1, date: '2021-10-2' },
  { price: 17, date: '2021-10-1' }
];


let startDate = '2021-10-1';
let endDate = '2021-10-20';

// transform str to Date
const toDate = (dateStr) => {
  const [year, month, day] = dateStr.split("-");
  // console.log('check date')
  // console.log([day, month, year])
  return new Date(year,  month - 1, day);
}

function get_staticstic(probeAr, start, end) {
  let result = null;
  let minDate = toDate(start);
  let maxDate = toDate(end);
  console.log('maxDate', maxDate);
  console.log('minDate', minDate);
  for (let tempEvent of probeAr) {
    let currentDate = toDate(tempEvent.date);
    console.log('currentDate', currentDate);
    if (currentDate >= minDate && currentDate <= maxDate) {
      console.log('Correct Date');
    }
    else {
      console.log('Out Side range!!');
    }
  }
  return result
}
get_staticstic(probeArray, startDate, endDate);

更好的方法

由于所有日期字串 ae 都是標準格式，因此您不需要為日期撰寫決議器函式。您可以使用new Date(dateString)方法直接轉換為日期物件。

作業小提琴

let probeArray = [
  { price: 123, date: '2021-11-27' },
  { price: 13, date: '2021-11-15' },
  { price: 1, date: '2021-10-2' },
  { price: 17, date: '2021-10-1' }
];


let startDate = '2021-10-1';
let endDate = '2021-10-20';


function get_staticstic(probeAr, start, end) {
  let result = null;
  let minDate = new Date(start);
  let maxDate = new Date(end);
  console.log('maxDate', maxDate);
  console.log('minDate', minDate);
  for (let tempEvent of probeAr) {
    let currentDate = new Date(tempEvent.date);
    console.log('currentDate', currentDate);
    if (currentDate >= minDate && currentDate <= maxDate) {
      console.log('Correct Date');
    }
    else {
      console.log('Out Side range!!');
    }
  }
  return result
}
get_staticstic(probeArray, startDate, endDate);

uj5u.com熱心網友回復：

您應該設定minDate為開始日期和maxDate結束日期。你做了相反的事情。

let probeArray = [{price: 123, date: '2021-11-27'}, 
{price: 13, date: '2021-11-15'}, 
{price: 1, date: '2021-10-2'}, 
{price: 17, date: '2021-10-1'}];


let startDate = '2021-10-1';
let endDate = '2021-10-20';

// transform str to Date
const toDate = (dateStr) => {
    const [year,month,day] = dateStr.split("-");
    // console.log('check date')
    // console.log([day, month, year])
    return new Date(year, month - 1,  day 1);
  }


function get_statistic(probeAr, start, end){
    
    let result = null;
    let minDate = toDate(start);
    let maxDate = toDate(end);

    for (let tempEvent of probeAr){
        let currentDate = toDate(tempEvent.date);
        console.log('maxDate', maxDate);
        console.log('minDate', minDate);
        console.log('currentDate',currentDate);

    
        if (currentDate >= minDate && currentDate <= maxDate ){
             console.log('Correct Date');
        }
        else{
            console.log('Out Side range!!');
        }
    

    }
    return result
}
get_statistic(probeArray, startDate, endDate);

標籤：javascript

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