為了加強對JavaScript原生代碼的編寫能力，以及鞏固setTimeout()的使用方法，制作了一個倒計時的demo，倒計時在現在的網站中算是一個常見的小功能，如果大家喜歡的話可以留下，就當作一個日常實用的小腳本。
實現思路
1、先獲取小時值 將小時值減1開始進行倒計時 分鐘59 秒數59
2、秒數的個位從9開始遞減，當秒數個位小于0時，秒數的十位減1
3、秒數的十位小于0時，分鐘的個位減1
4、分鐘的個位小于0時，分鐘的十位減1
5、分鐘的十位小于0時，小時減1
6、小時數小于0后停止計時全部為0
實現代碼
html
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<p>倒計時：</p><span id="hour">5</span><span>:</span><span id="minuteTen">0</span><span id="minuteBit">0</span><span>:</span><span id="secondTen">0</span><span id="secondBit">0</span> |
css
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span{ display: inline-block; width: 20px; height: 20px; background-color: #000000; color: #ffffff; text-align: center; } |
JavaScript
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function time(){ /*小時*/ var hourTxt = document.getElementById("hour"); var hour = parseInt(document.getElementById("hour").innerHTML); /*分鐘*/ var minuteTenTxt = document.getElementById("minuteTen"); var minuteBitTxt = document.getElementById("minuteBit"); var minuteTen = parseInt(document.getElementById("minuteTen").innerHTML); var minuteBit = parseInt(document.getElementById("minuteBit").innerHTML); /*秒*/ var secondTenTxt = document.getElementById("secondTen"); var secondBitTxt = document.getElementById("secondBit"); var secondTen = parseInt(document.getElementById("secondTen").innerHTML); var secondBit = parseInt(document.getElementById("secondBit").innerHTML); function start(){ hour--; hourTxt.innerHTML = hour; minuteTen = 5; minuteTenTxt.innerHTML = minuteTen; minuteBit = 9; minuteBitTxt.innerHTML = minuteBit; secondTen = 5; secondTenTxt.innerHTML = secondTen; secondBit = 9; secondBitTxt.innerHTML = secondBit; /*secondBit開始自減*/ function second(){ secondBit--; secondBitTxt.innerHTML = secondBit; /*十秒過后*/ if(secondBit < 0){ secondTen--; secondTenTxt.innerHTML = secondTen; secondBit = 9; secondBitTxt.innerHTML = secondBit; /*繼續倒計時*/ setTimeout(second,1000); /*一分鐘過后*/ if(secondTen < 0){ minuteBit--; minuteBitTxt.innerHTML = minuteBit; secondTen = 5; secondTenTxt.innerHTML = secondTen; secondBit = 9; secondBitTxt.innerHTML = secondBit; /*十分鐘過后*/ if(minuteBit < 0){ minuteTen--; minuteTenTxt.innerHTML = minuteTen; minuteBit = 9; minuteBitTxt.innerHTML = minuteBit; } /*一個小時過后*/ if(minuteTen < 0){ hour--; hourTxt.innerHTML = hour; minuteTen = 5; minuteTenTxt.innerHTML = minuteTen; minuteBit = 9; minuteBitTxt.innerHTML = minuteBit; secondTen = 5; secondTenTxt.innerHTML = secondTen; secondBit = 9; secondBitTxt.innerHTML = secondBit; } /*倒計時結束*/ if(hour < 0 ){ hour = 0; hourTxt.innerHTML = hour; minuteTen = 0; minuteTenTxt.innerHTML = minuteTen; minuteBit = 0; minuteBitTxt.innerHTML = minuteBit; secondTen = 0; secondTenTxt.innerHTML = secondTen; secondBit = 0; secondBitTxt.innerHTML = secondBit; clearTimeout(second); clearTimeout(start); } } }else{ setTimeout(second,1000); } } setTimeout(second,1000); } setTimeout(start,1000);} |
執行頁面
結束頁面
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：https://blog.csdn.net/zm_nizhi/article/details/74388709
