用JS寫了一個30分鐘倒計時器的實現(xiàn)示例
更新時間:2022年03月14日 08:30:19 作者:巨輪
本文主要介紹了用JS寫了一個30分鐘倒計時器的實現(xiàn)示例,文中通過示例代碼介紹的非常詳細,具有一定的參考價值,感興趣的小伙伴們可以參考一下
前端頁面倒計時功能在很多場景中會用到,如很多秒殺活動等,本文主要介紹了用JS寫了一個30分鐘倒計時器的實現(xiàn)示例,感興趣的可以了解一下
<!DOCTYPE HTML> <html> ?? ?<head> ?? ??? ?<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/> ?? ??? ?<title>Countdown Timer</title> ?? ??? ?<style type="text/css"> ?? ??? ??? ?input{ ?? ??? ??? ? ? ?padding-bottom: 0px; ?? ??? ??? ??? ?padding-top: 0px; ?? ??? ??? ??? ?border-top-width: 0px; ?? ??? ??? ??? ?border-left-width: 0px; ?? ??? ??? ??? ?border-right-width: 0px; ?? ??? ??? ??? ?font-size: 20px; ?? ??? ??? ??? ?width:100%; ?? ??? ??? ?} ?? ??? ?</style> ?? ?</head> ?? ? ?? ?<body> ?? ??? ?<span id="numbers" style="white-space:nowrap;"></span> ?? ??? ? ?? ??? ?<table id="table1" > ?? ??? ??? ?<tr> ?? ??? ??? ??? ?<td style="background-color:rgb(41, 74, 155);padding:3px;"></td> ?? ??? ??? ??? ?<td></td> ?? ??? ??? ?</tr> ?? ??? ??? ?<tr> ?? ??? ??? ??? ?<td style="width:100%;" colspan=2> ?? ??? ??? ??? ??? ?<input id="content"/> ?? ??? ??? ??? ?</td> ?? ??? ??? ?</tr> ?? ??? ??? ?<tr> ?? ??? ??? ??? ?<td style="width:100%;" colspan=2> ?? ??? ??? ??? ??? ?<canvas id="myCanvas" height="6"> ?? ??? ??? ??? ??? ?Your browser does not support the canvas element. ?? ??? ??? ??? ??? ?</canvas> ?? ??? ??? ??? ?</td> ?? ??? ??? ?</tr> ?? ??? ??? ? ?? ??? ??? ? ?? ??? ?</table> ?? ??? ? ?? ??? ?<audio id='music'> ?? ??? ? ?<source src="music/Windows XP 啟動.wav" type="audio/mpeg"> ?? ??? ? ?Your browser does not support the audio tag. ?? ??? ?</audio> ?? ??? ? ?? ??? ?<audio id='music2'> ?? ??? ? ?<source src="music/Windows XP 關機.wav" type="audio/mpeg"> ?? ??? ? ?Your browser does not support the audio tag. ?? ??? ?</audio> ?? ??? ? ?? ??? ?<script type="text/javascript" > ?? ??? ??? ?var timer = { ?? ??? ??? ??? ?initMinutes:30, ?? ??? ??? ??? ?restSeconds:0, ?? ??? ??? ??? ?minute:0, ?? ??? ??? ??? ?second:0, ?? ??? ??? ??? ?handle:0, ?? ??? ??? ??? ?stopFlag:false, ?? ??? ??? ??? ?startTime:0, ?? ??? ??? ??? ?content:"asdasd", ?? ??? ??? ??? ?coverFlag:false, ?? ??? ??? ??? ?setFontSize:function(){ ?? ??? ??? ??? ??? ?document.getElementById("numbers").style.fontSize = (window.innerWidth ?? ??? ??? ??? ??? ??? ??? ??? ?|| document.documentElement.clientWidth ?? ??? ??? ??? ??? ??? ??? ??? ?|| document.body.clientWidth) / 3 + "px" ?? ??? ??? ??? ?}, ?? ??? ??? ??? ?refreshTable:function(){ ?? ??? ??? ??? ??? ?//進度條 ?? ??? ??? ??? ??? ?var table = document.getElementById("table1") ?? ??? ??? ??? ??? ?var span = document.getElementById('numbers') ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?//刷新進度條 ?? ??? ??? ??? ??? ?//table2.style.width =? ?? ??? ??? ??? ??? ?table.style.width = span.offsetWidth + "px" ?? ??? ??? ??? ??? ?var progress = 1 ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?if(this.restSeconds > 0) ?? ??? ??? ??? ??? ??? ?progress = this.restSeconds / (this.initMinutes * 60) ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?document.querySelector('#table1 td:nth-of-type(1)').style.width = progress * 100 + "%" ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?var td2 = document.querySelector('#table1 td:nth-of-type(2)') ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?if (progress < 1){ ?? ??? ??? ??? ??? ??? ?td2.style.width = (1 - progress) * 100 + "%" ?? ??? ??? ??? ??? ?}else{ ?? ??? ??? ??? ??? ??? ?td2.style.display = "none" ?? ??? ??? ??? ??? ?} ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?var canvas = document.getElementById('myCanvas') ?? ??? ??? ??? ??? ?canvas.width = span.offsetWidth ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?var ctx = canvas.getContext("2d") ?? ??? ??? ??? ??? ?var rectWeight = progress * span.offsetWidth ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?ctx.clearRect(0, 0, span.offsetWidth, 20) ?? ??? ??? ??? ??? ?ctx.fillStyle = "#FF0000" ?? ??? ??? ??? ??? ?//console.log("rectWeight: " + rectWeight) ?? ??? ??? ??? ??? ?//console.log(progress * span.offsetWidth) ?? ??? ??? ??? ??? ?ctx.fillRect(0, 0, rectWeight, 20) ?? ??? ??? ??? ?}, ?? ??? ??? ??? ?init:function(){ ?? ??? ??? ??? ??? ?this.startTime = Date.now() ?? ??? ??? ??? ??? ?var span = document.getElementById('numbers') ?? ??? ??? ??? ??? ?this.setFontSize() ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?this.restSeconds = this.initMinutes * 60? ?? ??? ??? ??? ??? ?this.minute = this.initMinutes ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?var obj = this ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?this.handle = setInterval(function(){ ?? ??? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ??? ?if(obj.stopFlag) ?? ??? ??? ??? ??? ??? ??? ?return ?? ??? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ??? ?if(obj.restSeconds > 0){ ?? ??? ??? ??? ??? ??? ??? ?span.innerHTML = "" + (obj.minute < 10 ? "0" + obj.minute : obj.minute) + ":" +? ?? ??? ??? ??? ??? ??? ??? ?(!obj.coverFlag ? (obj.second < 10 ? "0" + obj.second : obj.second) : " ".repeat(4)) ?? ??? ??? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ??? ??? ?if(obj.restSeconds > 0){ ?? ??? ??? ??? ??? ??? ??? ??? ?obj.restSeconds -= 1 ?? ??? ??? ??? ??? ??? ??? ?} ?? ??? ??? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ??? ??? ?obj.minute = ?Math.floor(obj.restSeconds / 60) ?? ??? ??? ??? ??? ??? ??? ?obj.second = ?obj.restSeconds - obj.minute * 60 ?? ??? ??? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ??? ??? ?//刷新進度條 ?? ??? ??? ??? ??? ??? ??? ?obj.refreshTable() ?? ??? ??? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ??? ?}else{ ?? ??? ??? ??? ??? ??? ??? ?span.innerHTML = "Time " ?? ??? ??? ??? ??? ??? ??? ?window.clearInterval(obj.handle) ?? ??? ??? ??? ??? ??? ??? ?document.getElementById("music2").play() ?? ??? ??? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ??? ??? ?//跑完后記錄 ?? ??? ??? ??? ??? ??? ??? ?var content = document.getElementById("content").value ?? ??? ??? ??? ??? ??? ??? ?obj.markdownRecord(content) ?? ??? ??? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ??? ??? ?//不停地閃爍 ?? ??? ??? ??? ??? ??? ??? ?window.setInterval(function(){ ?? ??? ??? ??? ??? ??? ??? ??? ?span.innerHTML = (span.innerHTML == "Time ")?"is up.":"Time " ?? ??? ??? ??? ??? ??? ??? ?}, 5000) ?? ??? ??? ??? ??? ??? ?} ?? ??? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?}, 1000) ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?document.getElementById("music").play() ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?var numbers = document.getElementById("numbers") ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?numbers.addEventListener("click", function(){ ?? ??? ??? ??? ??? ??? ?obj.coverFlag = !obj.coverFlag ?? ??? ??? ??? ??? ?}) ?? ??? ??? ??? ??? ?numbers.addEventListener("dblclick", function(){ ?? ??? ??? ??? ??? ??? ?obj.stopFlag = !obj.stopFlag ?? ??? ??? ??? ??? ?}) ?? ??? ??? ??? ??? ?document.getElementById('content').addEventListener("blur", function(){ ?? ??? ??? ??? ??? ??? ?if(obj.restSeconds > 0) ?? ??? ??? ??? ??? ??? ??? ?return ?? ??? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ??? ?var content = document.getElementById("content").value ?? ??? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ??? ?if(this.content != content){ ?? ??? ??? ??? ??? ??? ??? ?this.content = content ?? ??? ??? ??? ??? ??? ??? ?obj.markdownRecord(content) ?? ??? ??? ??? ??? ??? ?} ?? ??? ??? ??? ??? ?}) ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?document.getElementById('table1').addEventListener("dblclick", function(){ ?? ??? ??? ??? ??? ??? ?console.log("timerHistory:") ?? ??? ??? ??? ??? ??? ?console.log(localStorage.getItem('timerHistory')) ?? ??? ??? ??? ??? ??? ?console.log("\n") ?? ??? ??? ??? ??? ??? ?obj.exportHistory() ?? ??? ??? ??? ??? ?}) ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ?}, ?? ??? ??? ??? ?markdownRecord:function(content){ ?? ??? ??? ??? ??? ?var records = [] ?? ??? ??? ??? ??? ?var timerHistory = localStorage.getItem("timerHistory") ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?if(timerHistory != null){ ?? ??? ??? ??? ??? ??? ?records = JSON.parse(timerHistory) ?? ??? ??? ??? ??? ?} ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?var lastRecord = records[0] ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?if(lastRecord && lastRecord.start == this.startTime){ ?? ??? ??? ??? ??? ??? ?lastRecord.note = content ?? ??? ??? ??? ??? ?}else{ ?? ??? ??? ??? ??? ??? ?var history = { ?? ??? ??? ??? ??? ??? ??? ?start:this.startTime, ?? ??? ??? ??? ??? ??? ??? ?duration:this.initMinutes, ?? ??? ??? ??? ??? ??? ??? ?note:content ?? ??? ??? ??? ??? ??? ?} ?? ??? ??? ??? ??? ??? ?records.unshift(history)//數(shù)組頭插入元素?? ??? ??? ? ?? ??? ??? ??? ??? ?} ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?var recordsJson = JSON.stringify(records) ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?//將結果存入本地 ?? ??? ??? ??? ??? ?localStorage.setItem("timerHistory", recordsJson) ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ?console.log(records[0]) ?? ??? ??? ??? ??? ?console.log("Marked it Down.") ?? ??? ??? ??? ??? ? ?? ??? ??? ??? ?}, ?? ??? ??? ??? ?exportHistory:function(){ ?? ??? ??? ??? ??? ?var filename = 'record' + Date.now() +'.txt' ?? ??? ??? ??? ??? ?var text = localStorage.getItem('timerHistory') ?? ??? ??? ??? ??? ?this.exportFile(filename, text) ?? ??? ??? ??? ?}, ?? ??? ??? ??? ?exportFile:function(filename, text){ ?? ??? ??? ??? ??? ?var element = document.createElement('a'); ?? ??? ??? ??? ??? ?element.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text)); ?? ??? ??? ??? ??? ?element.setAttribute('download', filename); ?? ??? ??? ??? ??? ?element.style.display = 'none'; ?? ??? ??? ??? ??? ?document.body.appendChild(element); ?? ??? ??? ??? ??? ?element.click(); ?? ??? ??? ??? ??? ?document.body.removeChild(element); ?? ??? ??? ??? ?} ?? ??? ??? ?} ?? ??? ??? ? ?? ??? ??? ?window.onresize = function(){ ?? ??? ??? ??? ?timer.setFontSize() ?? ??? ??? ??? ?timer.refreshTable() ?? ??? ??? ?} ?? ??? ??? ? ?? ??? ??? ?//pause ?? ??? ??? ?window.onclick = function(){ ?? ??? ??? ??? ?//timer.stopFlag = !timer.stopFlag ?? ??? ??? ?} ?? ??? ??? ? ?? ??? ??? ?//main ?? ??? ??? ?window.onload = function(){ ?? ??? ??? ??? ?timer.init()?? ? ?? ??? ??? ?} ?? ??? ?</script> ?? 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