利用JavaScript实现网页时钟,效果如下图所示:
首先在body中完成表盘、指针的资源载入:
<div><img src="../../image/clockface.jpg" alt=""></div> <hr id="hour" > <hr id="min"> <hr id="second">
设置CSS样式:
<style> body{ margin: 0; } div{ margin: 0 auto; width: 600px; height: 600px; } #hour{ background-color: black; width: 130px; height: 10px; position: fixed; top: 295px; left: 50%; margin-left: -65px; } #min{ background-color: red; width: 200px; height: 8px; position: fixed; top: 296px; left: 50%; margin-left: -100px; } #second{ background-color: yellow; width: 270px; height: 5px; position: fixed; top: 297.5px; left: 50%; margin-left: -135px; } </style>
最后是JS代码部分,使用循环定时器setInterval()每秒调用一次主函数,主函数内使用new Date()创建时间对象,分别使用 .getHours();.getMinutes();.getSeconds()获得当前的时分秒,然后利用CSS自带动画-旋转改变指针的角度:
setInterval(watch,1000); var anjleSeconds=0,anjleMin=0,anjleHours=0; function watch() { var Time= new Date(); anjleSeconds=Time.getSeconds()/60*360+90; anjleMin=Time.getMinutes()/60*360+90; anjleHours=nowHours/12*360+90; document.getElementById("second").style.transform="rotate("+anjleSeconds+"deg)"; document.getElementById("min").style.transform="rotate("+anjleMin+"deg)"; document.getElementById("hour").style.transform="rotate("+anjleHours+"deg)"; }
完整代码如下:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <style> body{ margin: 0; } div{ margin: 0 auto; width: 600px; height: 600px; } #hour{ background-color: black; width: 130px; height: 10px; position: fixed; top: 295px; left: 50%; margin-left: -65px; } #min{ background-color: red; width: 200px; height: 8px; position: fixed; top: 296px; left: 50%; margin-left: -100px; } #second{ background-color: yellow; width: 270px; height: 5px; position: fixed; top: 297.5px; left: 50%; margin-left: -135px; } </style> </head> <body> <div><img src="../../image/clockface.jpg" alt=""></div> <hr id="hour" > <hr id="min"> <hr id="second"> <script> setInterval(watch,1000); var anjleSeconds=0,anjleMin=0,anjleHours=0; function watch() { var Time= new Date(); anjleSeconds=Time.getSeconds()/60*360+90; anjleMin=Time.getMinutes()/60*360+90; anjleHours=Time.getHours()/12*360+90; document.getElementById("second").style.transform="rotate("+anjleSeconds+"deg)"; document.getElementById("min").style.transform="rotate("+anjleMin+"deg)"; document.getElementById("hour").style.transform="rotate("+anjleHours+"deg)"; } </script> </body> </html>
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