這篇文章主要介紹了css3+js繪制動態(tài)時鐘的示例代碼,具有一定借鑒價值,感興趣的朋友可以參考下,希望大家閱讀完這篇文章之后大有收獲,下面讓小編帶著大家一起了解一下。
專注于為中小企業(yè)提供網(wǎng)站建設(shè)、做網(wǎng)站服務(wù),電腦端+手機(jī)端+微信端的三站合一,更高效的管理,為中小企業(yè)高青免費(fèi)做網(wǎng)站提供優(yōu)質(zhì)的服務(wù)。我們立足成都,凝聚了一批互聯(lián)網(wǎng)行業(yè)人才,有力地推動了上1000+企業(yè)的穩(wěn)健成長,幫助中小企業(yè)通過網(wǎng)站建設(shè)實現(xiàn)規(guī)模擴(kuò)充和轉(zhuǎn)變。先看看效果圖:
首先,思考了一下頁面的布局,大致需要4層div,最底層是一個表盤的背景圖,然后其余3層分別是時針,分針,秒針的圖層.
html代碼如下:
<div class="dial"> </div> <div class="bigdiv bigdiv1" id="secondHand"> <div class="secondHand"></div> </div> <div class="bigdiv bigdiv2" id="minuteHand"> <div class="minuteHand"></div> </div> <div class="bigdiv bigdiv3" id="hourHand"> <div class="center"></div> <div class="hourHand"></div> </div>
變量名是隨便起的,不要介意; class=center的這個div是表中心那個小黑點.
時針是60*60*60s轉(zhuǎn)一圈, 分針是60*60s轉(zhuǎn)一圈, 秒針是60s轉(zhuǎn)一圈, 所以css代碼如下:
.dial{ width:600px; height:600px; margin:0 auto; position: absolute; border-radius: 50%; overflow: hidden; background-color: rgba(153,50,204,0.2); background-image: url(img/表盤.jpg); background-size: 100% 100%; } .bigdiv{ width:600px; height:600px; margin:0 auto; position: absolute; border-radius: 50%; overflow: hidden; } .bigdiv>div{ position: absolute; left:298px; border-radius: 100px; } .bigdiv1{ animation: moves 60s steps(60) infinite; } .bigdiv1 .secondHand{ width:4px; height:250px; background-color: red; top:50px; left:298px; } .bigdiv2{ animation: moves 3600s steps(3600) infinite; } .bigdiv2 .minuteHand{ width:6px; height:180px; background-color: green; top:120px; left:297px; } .bigdiv3{ animation: moves 216000s steps(216000) infinite; } .bigdiv3 .hourHand{ width:8px; height:160px; background-color: orange; top:140px; left:296px; border-radius: 100px; } .bigdiv .center{ top:290px; left:290px; width:20px; height:20px; background-color: black; z-index: 2; } @keyframes moves{ from{ transform: rotateZ(0deg); } to{ transform: rotateZ(360deg); } }
這一步做完后效果圖是這個樣子的:
然后用js計算當(dāng)前時間,
var date = new Date(); var hours = date.getHours(); var minutes = date.getMinutes(); var seconds = date.getSeconds();
然后計算當(dāng)前每個針的旋轉(zhuǎn)角度
var secondAngle = seconds; var minuteAngle = minutes * 60 + seconds; var hourAngle = (60/12) * ((hours%12) * 3600 + minuteAngle);
現(xiàn)在的思路就是:每個針會按照自己定的時間轉(zhuǎn)一圈,初始角度也能知道,怎么組成一個顯示當(dāng)前時間的動態(tài)鐘表呢?
剛開始的想法是讓這3層div旋轉(zhuǎn)對應(yīng)的角度,然后再開始,后來一想不行,因為它還是固定的時間旋轉(zhuǎn)一周,指針指向會有偏差,
現(xiàn)在需要的是頁面進(jìn)來的第一圈旋轉(zhuǎn)固定角度,其余的按照原來固定的時間旋轉(zhuǎn)一周就行了,
css3里面有一個animation-delay屬性,它表示的意思是動畫延遲,負(fù)數(shù)就表示提前開始(比如-5s就表示動畫從第5s的時間開始),
剛好可以用到,讓這幾個指針提前開始對應(yīng)的角度.
js代碼如下:
hourHand.style.cssText = "animation-delay: -"+ hourAngle +"s"; minuteHand.style.cssText = "animation-delay: -"+ minuteAngle +"s"; secondHand.style.cssText = "animation-delay: -"+ secondAngle +"s";
最后自己再加了個動態(tài)時間在鐘表的上面展示
完整代碼:
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <style> body, html { margin: 0; } .location { position: relative; width: 600px; height: 600px; left: calc(50% - 300px); } .dial { width: 600px; height: 600px; margin: 0 auto; position: absolute; border-radius: 50%; overflow: hidden; background-color: rgba(153, 50, 204, 0.2); background-image: url(img/表盤.jpg); background-size: 100% 100%; } .bigdiv { width: 600px; height: 600px; margin: 0 auto; position: absolute; border-radius: 50%; overflow: hidden; } .bigdiv>div { position: absolute; left: 298px; border-radius: 100px; } .bigdiv1 { animation: moves 60s steps(60) infinite; } .bigdiv1 .secondHand { width: 4px; height: 250px; background-color: red; top: 50px; left: 298px; } .bigdiv2 { animation: moves 3600s steps(3600) infinite; } .bigdiv2 .minuteHand { width: 6px; height: 180px; background-color: green; top: 120px; left: 297px; } .bigdiv3 { animation: moves 216000s steps(216000) infinite; } .bigdiv3 .hourHand { width: 8px; height: 160px; background-color: orange; top: 140px; left: 296px; border-radius: 100px; } .bigdiv .center { top: 290px; left: 290px; width: 20px; height: 20px; background-color: black; z-index: 2; } @keyframes moves { from { transform: rotateZ(0deg); } to { transform: rotateZ(360deg); } } #dateshow { text-align: center; } </style> </head> <body> <h2 id="dateshow"></h2> <div class="location"> <div class="dial"></div> <div class="bigdiv bigdiv1" id="secondHand"> <div class="secondHand"></div> </div> <div class="bigdiv bigdiv2" id="minuteHand"> <div class="minuteHand"></div> </div> <div class="bigdiv bigdiv3" id="hourHand"> <div class="center"></div> <div class="hourHand"></div> </div> </div> <script> var dateshow = document.getElementById("dateshow"); var clock = { weeks: ["一", "二", "三", "四", "五", "六", "日"], getDate: function() { date = new Date(); year = date.getFullYear(); month = date.getMonth() + 1; day = date.getDate(); hours = date.getHours(); minutes = date.getMinutes(); seconds = date.getSeconds(); week = date.getDay(); // 星期 dateText = year + "年" + month + "月" + clock.format(day) + "日 星期" + clock.formatnum(week) + " " + clock.format(hours) + ":" + clock.format(minutes) + ":" + clock.format(seconds); return dateText; }, format: function(data) { if(data.toString().length == 1) { data = "0" + data; }; return data; }, formatnum: function(num) { return clock.weeks[num - 1]; }, showdate: function() { dateshow.innerText = clock.getDate(); }, go: function() { var secondHand = document.getElementById("secondHand"); var minuteHand = document.getElementById("minuteHand"); var hourHand = document.getElementById("hourHand"); date = new Date(); hours = date.getHours(); minutes = date.getMinutes(); seconds = date.getSeconds(); var secondAngle = seconds; var minuteAngle = minutes * 60 + seconds; var hourAngle = (60 / 12) * ((hours % 12) * 3600 + minuteAngle); hourHand.style.cssText = "animation-delay: -" + hourAngle + "s"; minuteHand.style.cssText = "animation-delay: -" + minuteAngle + "s"; secondHand.style.cssText = "animation-delay: -" + secondAngle + "s"; } } clock.go(); clock.showdate(); setInterval("clock.showdate()", 1000); </script> </body> </html>
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