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Use H5 and C3 to achieve simple clock effects

php中世界最好的语言Original: 2018-01-19 09:39:042209browse

This time I will bring you how to use H5 and C3 to achieve a simple clock effect. What are the precautions? Here are practical cases, 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 properties to define animations;

3) Use transform-origin to realize the rotation origin Circle center adjustment

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>
    <div id = "box">
            <div 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>
                <div id = "fixPoint"></div>
                <div id = "hourHand"></div>
                <div id = "minuteHand"></div>
                <div id = "secondHand"></div>
            </div>
        </div>
<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(&#39;hourHand&#39;);
            var minuteHand = document.getElementById(&#39;minuteHand&#39;);
            var secondHand = document.getElementById(&#39;secondHand&#39;);
setInterval(function(){
                    var currentTime = new Date();
                    var hourValue = currentTime.getHours();
                    var hourAngle = hourValue / 24 * 360 + &#39;deg&#39;;
                    var minuteValue = currentTime.getMinutes();
                    var minuteAngle = minuteValue / 60 * 360 + &#39;deg&#39;;
                    var secondValue = currentTime.getSeconds();
                    var secondAngle = secondValue / 60 * 360 + &#39;deg&#39;;
                    console.log(hourAngle);
// 方法一：利用jquery的css()增加属性
var cmdHour = &#39;rotate(&#39;+ hourAngle +&#39;)&#39;;
$(&#39;#hourHand&#39;).css({transform:&#39;rotate(&#39;+ hourAngle +&#39;)&#39;});
var cmdMinute = &#39;rotate(&#39;+ minuteAngle +&#39;)&#39;;
$(&#39;#minuteHand&#39;).css({transform:cmdMinute});
var cmdSecond = &#39;rotate(&#39;+ secondAngle +&#39;)&#39;;
$(&#39;#secondHand&#39;).css({transform:cmdSecond});
 
// 方法二：利用DOM元素的style属性设置
//      hourHand.style.transform = &#39;rotate(&#39;+ hourAngle + &#39;)&#39;;
//      minuteHand.style.transform = &#39;rotate(&#39;+ minuteAngle + &#39;)&#39;;
//      secondHand.style.transform = &#39;rotate(&#39;+ secondAngle + &#39;)&#39;; 
 
},1000);
}
    </script>
</body>
</html>

I believe you have mastered the method after reading these cases. For more exciting things, please pay attention to php Chinese Other related articles online!

Use H5 and C3 to achieve simple clock effects

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