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This article introduces the relevant knowledge of "how to use JavaScript to achieve JD.com 's second kill effect". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

First, use html and css to build a shelf:

* {margin: 0; padding: 0;} .box {width: 190px; height: 270px; color: # fff; text-align: center; margin: 100px auto; background-color: # d00; padding-top: 40px Box-sizing: border-box;} .box > h4 {font-size: 26px;} .box > p:nth-of-type (1) {color: rgba (255,255,255, .5); margin-top: 5px;} .box > I {display: inline-block Margin-top: 5px; margin-bottom: 5px; font-size: 40px.box > .time {display: flex; justify-content: center; margin-top: 10px;} .time > div {width: 40px; height: 40px Background: # 333; line-height: 40px; text-align: center; font-weight: 700; position: relative;} .time > div::before {content: "; display: block; width: 100%; height: 2px; background: # D00 Position: absolute; left: 0; top: 50%; transform: translateY (- 50%);} .time > .kill {margin: 010px;} JD.com second kill

FLASH DEALS

There is still time left before the end of the game.

00 00 00

Then design its logical part:

Get related elements

To define a function that handles two time differences, it is important to note that if the hours, minutes, and seconds are less than 10, you should add "0" to occupy the space, and finally return it in the form of an object.

In order to achieve a dynamic effect, we can use setInterval () to put all the acquired time and seconds into it and make it change every other second.

In order to see the effect as soon as the user opens it, we can encapsulate the acquired time and seconds into a function, which can be realized by calling the function directly inside and outside setInterval ().

/ / 1. Get the element const oHour = document.querySelector (".hour"); const oMinute = document.querySelector (".hour"); const oSecond = document.querySelector (".second"); / / 2. Processing time difference const remDate = new Date ("2021-10-28 23:59:59"); setTime (remDate); / / start timer setInterval (function () {setTime (remDate);}, 1000) / / in order to let users see the effect as soon as they come in, instead of the first three 00 / / we can encapsulate it with function setTime (remDate) {const obj = getDifferTime (remDate); / / console.log (obj); / / 3. Set the difference to the element oHour.innerText = obj.hour; oMinute.innerText = obj.minute; oSecond.innerText = obj.second;} function getDifferTime (remDate, curDate = new Date ()) {/ / 1. Get the difference between two times (milliseconds) const differTime = remDate-curDate; / / 2. Get the difference between two times (seconds) const differSecond = differTime / 1000; / / 3. Use the total seconds of difference / seconds of each day = days of difference let day = Math.floor (differSecond / (60 * 60 * 24)); day = day > = 10? Day: "0" + day; / / 4. Use the total seconds of difference / hour% 24 let hour = Math.floor (differSecond / (60 * 60)% 24); hour = hour > = 10? Hour: "0" + hour; / / 5. Use the total seconds / minute 60 let minute = Math.floor (differSecond / 60% 60); minute = minute > = 10? Minute: "0" + minute; / / 6. Use the total seconds of difference let second = Math.floor (differSecond% 60); second = second > = 10? Second: "0" + second; return {day: day, hour: hour, minute: minute, second: second,}}

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