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"Clock Display Project" description document (Document has the corresponding code at the end)
1. The code structure is clear and clear
2. Can dynamically display the current time and date in real time
3. The interface is simple, beautiful and generous
4. Improve browser compatibility
jQuery, native javascript, css3, h5
1. Obtaining the rotation angle of each pointer
First of all, we must clarify the following concepts:
The clock hand rotates 360 degrees in a circle
Hour hand:
There are 12 hours in total on the dial. Every hour, it rotates 30 degrees;
Minute hand:
There are 60 hours in total on the dial Grid, every minute the minute hand moves through a small grid, it rotates 6 degrees;
Second hand:
There are a total of 60 small grids on the dial , every minute the second hand moves, it passes through a small grid and rotates 6 degrees;
(1) Obtaining the current time
Give an example Example (taking the hour hand rotation angle calculation as an example): For example, the current time is 9:28;
The hour hand should be between 9 and 10, and only the hour can be obtained through the method, so both To obtain the current hour, you must also obtain the current minute, so that you can better determine the rotation angle of the hour hand, which is as follows:
(2) Rotation Obtaining the angle
Since the hour hand rotates 30 degrees after every hour, the rotation angle of the hour hand is obtained as follows:
Similarly, the angle of the minute hand and the second hand The rotation angle is as follows:
Minute hand:
Second hand:
In order to make the clock more accurate , here is accurate to milliseconds;
(3) Execution frequency, that is, second hand rotation frequency control
Adjust the execution time interval of the function to change the second hand rotation frequency .
1. The page is too concise and needs further optimization and improvement;
2. There is no time to draw minutes and seconds on the clock when drawing;
1.HTML code
jQuery指针时钟(附带日期)
2.css code
* { margin:0; padding:0; } body { background:#f9f9f9; color:#000; font:15px Calibri, Arial, sans-serif; text-shadow:1px 2px 1px #FFFFFF; } a, a:visited { text-decoration:none; outline:none; color:#fff; } a:hover { text-decoration:underline; color:#ddd; } /*the footer (尾部)*/ footer { background:#444 url("../images/bg-footer.png") repeat; position:fixed; width:100%; height:70px; bottom:0; left:0; color:#fff; text-shadow:2px 2px #000; /*提高浏览器的兼容性*/ -moz-box-shadow:5px 1px 10px #000; -webkit-box-shadow:5px 1px 10px #000; box-shadow:5px 1px 10px #000; } footer h1 { font:25px/26px Acens; font-weight:normal; left:50%; margin:0px 0 0 150px; padding:25px 0; position:relative; width:400px; } footer a.orig, a.orig:visited { background:url("../images/demo2.png") no-repeat right top; border:none; text-decoration:none; color:#FCFCFC; font-size:14px; height:70px; left:50%; line-height:50px; margin:12px 0 0 -400px; position:absolute; top:0; width:250px; } /*styling for the clock(时钟样式)*/ #clock { position: relative; width: 600px; height: 600px; list-style: none; margin: 20px auto; background: url('../images/clock.png') no-repeat center; } #seconds, #minutes, #hours { position: absolute; width: 30px; height: 580px; left: 270px; } #date { position: absolute; top: 365px; color: #666; right: 140px; font-weight: bold; letter-spacing: 3px; font-family: "微软雅黑"; font-size: 30px; line-height: 36px; } #hours { background: url('../images/hands.png') no-repeat left; z-index: 1000; } #minutes { background: url('../images/hands.png') no-repeat center; width:25px; z-index: 2000; } #seconds { background: url('../images/hands.png') no-repeat right; z-index: 3000; }
View Code
3.js code
(1) You need to download a js reference package (you will know it by Baidu or Google)
(2) js code
$(document).ready(function () { //动态插入HTML代码,标记时钟 var clock = [ '
4. Some necessary picture materials (c will not be listed or displayed one by one here)
Notes:
1.Transform property
2.rotate() method
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