这是一款使用纯js实现电子时钟特效。该电子时钟可以显示时间,星期几,以及是上午还是下午。它使用简单,非常容易集成到项目中。
使用方法
在页面中引入电子时钟的样式文件main.css。
<link rel="stylesheet" type="text/css" href="css/main.css">
HTML结构
该电子时钟的基本HTML结构如下:
<main> <!-- 星期几 --> <div class="days"> <div class="day"> <p class="sunday">星期日</p> </div> <div class="day"> <p class="monday">星期一</p> </div> <div class="day"> <p class="tuesday">星期二</p> </div> <div class="day"> <p class="wednesday">星期三</p> </div> <div class="day"> <p class="thursday">星期四</p> </div> <div class="day"> <p class="friday">星期五</p> </div> <div class="day"> <p class="saturday">星期六</p> </div> </div> <!-- CLOCK --> <div class="clock"> <!-- 小时 --> <div class="numbers"> <p class="hours"></p> <p class="placeholder">88</p> </div> <div class="colon"> <p>:</p> </div> <!-- 分 --> <div class="numbers"> <p class="minutes"></p> <p class="placeholder">88</p> </div> <div class="colon"> <p>:</p> </div> <!-- 秒 --> <div class="numbers"> <p class="seconds"></p> <p class="placeholder">88</p> </div> <!-- 上午 / 下午 --> <div class="am-pm"> <!-- AM --> <div> <p class="am">am</p> </div> <!-- PM --> <div> <p class="pm">pm</p> </div> </div> </div><!-- END CLOCK --> </main>
JavaScript
该电子时钟通过下面的js代码来获取系统时间,并通过定时器来动态更新时间的显示。
window.onload = function(){ time(); ampm(); whatDay(); setInterval(function(){ time(); ampm(); whatDay(); }, 1000); }; //gets current time and changes html to reflect it function time(){ var date = new Date(), hours = date.getHours(), minutes = date.getMinutes(), seconds = date.getSeconds(); //make clock a 12 hour clock instead of 24 hour clock hours = (hours > 12) ? (hours - 12) : hours; hours = (hours === 0) ? 12 : hours; //invokes function to make sure number has at least two digits hours = addZero(hours); minutes = addZero(minutes); seconds = addZero(seconds); //changes the html to match results document.getElementsByClassName('hours')[0].innerHTML = hours; document.getElementsByClassName('minutes')[0].innerHTML = minutes; document.getElementsByClassName('seconds')[0].innerHTML = seconds; } //turns single digit numbers to two digit numbers by placing a zero in front function addZero (val){ return (val <= 9) ? ("0" + val) : val; } //lights up either am or pm on clock function ampm(){ var date = new Date(), hours = date.getHours(), am = document.getElementsByClassName("am")[0].classList, pm = document.getElementsByClassName("pm")[0].classList; (hours >= 12) ? pm.add("light-on") : am.add("light-on"); (hours >= 12) ? am.remove("light-on") : pm.remove("light-on"); } //lights up what day of the week it is function whatDay(){ var date = new Date(), currentDay = date.getDay(), days = document.getElementsByClassName("day"); //iterates through all divs with a class of "day" for (x in days){ //list of classes in current div var classArr = days[x].classList; (classArr !== undefined) && ((x == currentDay) ? classArr.add("light-on") : classArr.remove("light-on")); } }
该电子时钟的github地址为:https://github.com/SlyTy7/clock
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