尽管数组具有值，但返回的长度为0 [英] array returns length of 0 although it has values

问题描述

所以我试图将项目推送到数组，尽管数组中有项目，但返回的长度似乎为0.

so i am trying to push items to an array and it appears to be return a length of 0 although there are items in the array.

let calendarDates = []

async function getDates() {
    const response = await fetch('/calendars/fetch_dates')
    let res = await response.json()
    res.forEach(el => {
        calendarDates.push(el)
    })
}

getDates()
createCalendar(date, side)
.
.
.

function createCalendar(date, side) {
    console.log('createCalendar', calendarDates, "is array?", Array.isArray(calendarDates), 'length', calendarDates.length)
.
.
}

我的console.log正在打印calendarDates和length: 数组

my console.log is printing calendarDates and length : array

控制台记录长度

console.log位于单独的函数中

the console.log lives in a seperate function

那么为什么长度返回0? 当尝试控制台记录一个forEach循环时，什么也没有返回，所以我不认为浏览器显示的是错误的值

so why is it returning 0 for the length? when trying to console log a forEach loop nothing returns either so i dont thing its the browser showing the wrong value for fun

推荐答案

这将有所帮助

async function Main() {
  let calendarDates = []
  calendarDates = await getDates();
  createCalendar(date, side)
}

async function getDates() {
  const response = await fetch('/calendars/fetch_dates')
  return await response.json();
}

function createCalendar(date, side) {
  console.log('createCalendar', calendarDates, "is array?", Array.isArray(calendarDates), 'length', calendarDates.length);
}


Main();

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