Question

我有：

import tkinter as tk  # PEP8: `import *` is not preferred
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BOARD)
GPIO.setup(8, GPIO.OUT)
GPIO.output(8, False)

button_pressed = False  # PEP8: preferred `lower_case_names`

# --- functions ---

def on_press(event):
    global button_pressed

    button_pressed = True
    GPIO.output(8, True)

def on_release(event):
    global button_pressed

    button_pressed = False
    GPIO.output(8, True)

    # run after 500ms (0.5s) instead of `sleep`
    master.after(500, blink_off)

def blink_off():
    if not button_pressed:
        GPIO.output(8, False)
        # run after 500ms (0.5s) instead of `sleep`
        master.after(500, blink_on)

def blink_on():
    if not button_pressed:
        GPIO.output(8, True)
        # run after 500ms (0.5s) instead of `sleep`
        master.after(500, blink_off)

# --- main ---

master = tk.Tk()

button = tk.Button(master, text="Turn on light")
button.pack()

# here "button" means "tk.Button" and "Button" means "mouse left button"
button.bind('<ButtonPress>',   on_press)   # mouse left button pressed on tk.Button 
button.bind('<ButtonRelease>', on_release) # mouse left button released on tk.Button

# start blinking - it will use `after()` to loop
blink_on()

master.mainloop()

我尝试过：

Thu Apr 23 2020 00:00:00 GMT+0200 (Ora legale dell’Europa centrale)

但这不是正确的

我在看dateStart = new Date(dateStart);

Answer 1

类似

const dateStart = new Date('Thu Apr 23 2020 00:00:00 GMT+0200');
const formatted = `${dateStart.getDate()}/${dateStart.getMonth() + 1}/${dateStart.getFullYear().toString().substr(-2)}`

Answer 2

如果，当您考虑操作Date对象时，您会想到MomentJ ... ...不要着急！ you might not even need就是66Kb，这很简单！ ?

对于您来说，这很简单：

由于您已经拥有date()对象reading the docs，因此您可以访问日期的所有部分，尽管getMonth()有点奇怪?‍♂️

如此：

var dateStart = new Date()
var dateAsString = `${dateStart.getDate()}/${dateStart.getMonth()+1}/${dateStart.getFullYear().toString().substr(-2)}`

console.log(dateAsString)

Answer 3

在Nodejs中。 library。 Snippet

const DATE_FORMATER = require( 'dateformat' );
let datetime = DATE_FORMATER( new Date(dateStart), "dd/mm/yy" );
console.log(datetime);

如何将字符串日期转换为日期格式？

3 个答案: