H5+C3 achieves clock effect-H5 Tutorial-php.cn

H5+C3 achieves clock effect

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Release： 2018-03-27 10:52:36

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This time I will bring you H5+C3 to achieve the clock effect. What are the precautions for H5+C3 to achieve the clock effect? The following is a practical case, let’s take a look.

Purpose:

Use html5 and css to achieve the pendulum effect

Knowledge points:

1) Use position/left/top and calc() to achieve horizontal and vertical centering of elements;

2) Use CSS3 animation/transform/transform-origin attribute definition Animation;

3) Use transform-origin to adjust the center of the rotation origin

No more nonsense, let’s look at the code directly. The specific code is as follows:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title></title>
    <style>
        li{
            list-style:none;
        }
        #box{
            width: 400px;
            height: 400px;
            position: absolute;
            top:calc(50% - 200px);
            left:calc(50% - 200px);
            border: 2px solid palegoldenrod;
        }
        #dial{
            width: 200px;
            height: 200px;
            position: absolute;
            top:calc(50% - 100px);
            left:calc(50% - 100px);
            border: 2px solid cyan;
            border-radius: 50%;
        }   
        .scaleIndex{
            width: 4px;
            height: 12px;
            position: absolute;
            top: 0;
            left: calc(50% - 2px);
            background-color: gray;
            transform-origin: 2px 100px;
        }
        .angle30{transform : rotate(30deg);}
        .angle60{transform : rotate(60deg);}
        .angle90{transform : rotate(90deg);}
        .angle120{transform : rotate(120deg);}
        .angle150{transform : rotate(150deg);}
        .angle180{transform : rotate(180deg);}
        .angle210{transform : rotate(210deg);}
        .angle240{transform : rotate(240deg);}
        .angle270{transform : rotate(270deg);}
        .angle300{transform : rotate(300deg);}
        .angle330{transform : rotate(330deg);}
        #fixPoint{
            width: 10px;
            height: 10px;
            position: absolute;
            top:calc(50% - 5px);
            left:calc(50% - 5px);
            background-color: cadetblue;
            border-radius: 50%;
        }
        #hourHand{
            width: 6px;
            height: 70px;
            position:absolute;
            top: 40px;
            left: calc(50% - 3px);
            background-color: darkblue;
            transform-origin: 50% 60px;
        }
        #minuteHand{
            width: 4px;
            height: 75px;
            position:absolute;
            top: 35px;
            left: calc(50% - 2px);
            background-color: yellow;
            transform-origin: 50% 65px;
        }
        #secondHand{
            width: 2px;
            height: 90px;
            position:absolute;
            top: 20px;
            left: calc(50% - 1px);
            background-color: red;
            transform-origin: 50% 80px;
        }
    </style>
</head>
<body>
    <p id = "box">
            <p id = &#39;dial&#39;>
                <ul id = "scale">
                    <li class = "scaleIndex"></li>
                    <li class = "scaleIndex angle30"></li>
                    <li class = "scaleIndex angle60"></li>
                    <li class = "scaleIndex angle90"></li>
                    <li class = "scaleIndex angle120"></li>
                    <li class = "scaleIndex angle150"></li>
                    <li class = "scaleIndex angle180"></li>
                    <li class = "scaleIndex angle210"></li>
                    <li class = "scaleIndex angle240"></li>
                    <li class = "scaleIndex angle270"></li>
                    <li class = "scaleIndex angle300"></li>
                    <li class = "scaleIndex angle330"></li>
                </ul>
                <p id = "fixPoint"></p>
                <p id = "hourHand"></p>
                <p id = "minuteHand"></p>
                <p id = "secondHand"></p>
            </p>
        </p>
<script type = &#39;text/javascript&#39; src = &#39;js/jquery-3.2.1.js&#39;></script>
<script type = "text/javascript">
window.onload = function(){
            var hourHand = document.getElementById('hourHand');
            var minuteHand = document.getElementById('minuteHand');
            var secondHand = document.getElementById('secondHand');
setInterval(function(){
                    var currentTime = new Date();
                    var hourValue = currentTime.getHours();
                    var hourAngle = hourValue / 24 * 360 + 'deg';
                    var minuteValue = currentTime.getMinutes();
                    var minuteAngle = minuteValue / 60 * 360 + 'deg';
                    var secondValue = currentTime.getSeconds();
                    var secondAngle = secondValue / 60 * 360 + 'deg';
                    console.log(hourAngle);
// 方法一：利用jquery的css()增加属性
var cmdHour = 'rotate('+ hourAngle +')';
$('#hourHand').css({transform:'rotate('+ hourAngle +')'});
var cmdMinute = 'rotate('+ minuteAngle +')';
$('#minuteHand').css({transform:cmdMinute});
var cmdSecond = 'rotate('+ secondAngle +')';
$('#secondHand').css({transform:cmdSecond});
// 方法二：利用DOM元素的style属性设置
//      hourHand.style.transform = 'rotate('+ hourAngle + ')';
//      minuteHand.style.transform = 'rotate('+ minuteAngle + ')';
//      secondHand.style.transform = 'rotate('+ secondAngle + ')';  
},1000);
}
    </script>
</body>
</html>

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I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!