Date

  1. Date is a constructor whose prototype defines a number of Date methods

  2. Date()

    Perform Date(), returning a string representing the Date

  3. new Date()

    Returns the current date instance object with no arguments

    var date = new Date(a);console.log(Object.prototype.toString.call(date)); // [Object Date]
date.getFullYear() // Return the year, such as 2020
dae.getMonth() // Return month, subtract 1, add 1 to get month
date.getDate() // Return the number from 1 to 31
date.getDay() // Return the day of the week, 0 to 7, starting on Sunday
date.getHours() // Return hour
date.getMinutes() // Return minutes
date.getSeconds() // Return the number of seconds
date.getMilliseconds() // Return the number of milliseconds
// There is also a set method
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    With parameters, return the corresponding date

    var date = new Date(2020.1.1.8.30.10);
var date = new Date('2020/1/1 8:30:10');
var date = new Date('2020/01/01 08:30:10');
var date = new Date('the 2020-1-1 8:30:10');
// Sat Feb 01 2020 8:30:10 GMT+0800
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  4. getTime()

    Returns a timestamp, which is the number of milliseconds

    Computer era time is 0, 0 minutes 0 seconds on January 1, 1970

    Timestamp: The number of milliseconds elapsed between a certain time and the computer epoch time

    var dateTime = new Date().getTime(); // Return the timestamp of the current time
var date = new Date(dateTime); // Return the time corresponding to the timestamp
date.setTime(dateTime); // Set the timestamp as the standard
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The timer

  1. setInterval

    The internal function is executed every specified number of milliseconds, starting from the current time

    Returns a number that uniquely identifies the timer and represents the sequence number in all timers and delayers

    Is a method under window

    setInterval(function(){},1000) // Anonymous function
funtion Test(){}setInterval(test, 1000);
setInterval('test()'.1000); // Pass the method as a string
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  2. clearInterval

    Cleanup timer

    var timer = setInterval(function(){}, 1000); // The timer is a unique identifier that represents the sequence number in all timers
clearInterval(timer);
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decelerator

  1. setTimout

    Delay specifies the time to execute an internal function once

    Returns a number that uniquely identifies the delayer and represents the serial number of all timers and delayers

    setTimeout(function(){},1000) // Anonymous function
funtion Test(){}setTimeout(test, 1000);
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  2. clearTimeout

    Clearance delay device

    var timer = setTimeout(function(){}, 1000); // The timer is a unique identifier that represents the sequence number in all timers
clearTimeout(timer);
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Timing task

  1. function

    The task is executed when the condition is met. If the condition is not met within the set time, the callback function is executed

  2. parameter

    • Re: determine the condition function, return the condition to execute fn
    • Fn: The target function waiting to be executed
    • The time interval of space: setInterVal, space | | 100
    • Wait: setTimeOut waiting time, wait | | 3000
    • Back: callback function if fn fails to execute successfully

  3. code

    function timer(re, fn, space, wait, back) {
    if (re()) {
        fn();
    } else {
        var interval = setInterval(function() {
            if (re()) {
                fn();
                clearInterval(interval);
                interval = null;
            }
        }, space || 100);
        setTimeout(function() {
            if (interval) {
                clearInterval(interval);
                interval = null;
                back && back();
            }
        }, wait || 3000); }}Copy the code