利用css+原生js制作简单的钟表。效果如下所示
实现该效果，分三大块：html、javascript、css
html部分
html部分比较简单，定义一个clock的div，内部有原点、时分秒针、日期以及时间，至于钟表上的刻度、数字等元素，因为量比较多，采用jvascript生成
<!doctype html><html><head> <meta charset="UTF-8"> <link rel='stylesheet' href='外部的css文件路径' /> <title>时钟</title></head><body> <div class="clock" id="clock"> <!-- 原点 --> <div class="origin"></div> <!-- 时分秒针 --> <div class="clock-line hour-line" id="hour-line"></div> <div class="clock-line minute-line" id="minute-line"></div> <div class="clock-line second-line" id="second-line"></div> <!-- 日期 --> <div class="date-info" id="date-info"></div> <!-- 时间 --> <div class="time-info" > <div class="time" id="hour-time"></div> <div class="time" id="minute-time"></div> <div class="time" id="second-time"></div> </div> </div><script type='text/javascript' src='外部的javascript文件路径'></script></body></html>
css部分
开始代码之前，有一些css的属性需要了解，比如定位(position)，边框圆角(border-radius),变换(transform)等
position属性
position属性规定元素的定位类型，有五个值：absolute、fixed、relative、static、inherit,默认为static，即没有定位，元素按正常文档流显示；这里主要用到的是absolute和relative
absulte值，将元素设置成绝对定位，相对于static定位意外的第一个上级元素进行定位，位置可以通过'left'、'top'、'right'、'bottom'属性进行定位；如果上级元素都是static定位，则相对于body元素的位置进行定位
本例中，设定最外层的div clock为relative，所有下级元素均设定为absolute绝对定位，然后通过设置left、top等属性的值，确定其相对于clock的位置。
border-radius属性
border-radius属性向元素添加圆角边框，可以设置四个圆角的大小，本例中使用该属性将clock元素设置成一个圆
此处写了一个示例：4个div元素，宽高都是100px，border-radius不同时的效果：
transform属性
transform属性向元素应用2D或3D旋转，该属性允许我们对元素进行旋转、缩放、移动、或倾斜。本例中时针、分针、秒针、刻度等均用transform属性设置旋转；另外，transform-origin属性可以设置元素的基点位置
css部分的代码
/* 全局 */*{ margin:0; padding:0;}.clock{ width:400px; height:400px; border:10px solid #333; box-shadow: 0px 0px 20px 3px #444 inset; border-radius:210px; position:relative; margin:5px auto; z-index:10; background-color:#f6f6f6;}/* 时钟数字 */.clock-num{ width:40px; height:40px; font-size:22px; text-align:center; line-height:40px; position:absolute; z-index:8; color:#555; font-family:fantasy, 'Trebuchet MS';}.em_num{ font-size:28px;}/* 指针 */.clock-line{ position:absolute; z-index:20;}.hour-line{width:100px; height:4px; top:198px; left:200px; background-color:#000; border-radius:2px; transform-origin:0 50%; box-shadow:1px -3px 8px 3px #aaa;}.minute-line{ width:130px; height:2px; top:199px; left:190px; background-color:#000; transform-origin:7.692% 50%; box-shadow:1px -3px 8px 1px #aaa;}.second-line{ width:170px; height:1px; top:199.5px; left:180px; background-color:#f60; transform-origin:11.765% 50%; box-shadow:1px -3px 7px 1px #bbb;}/* 原点 */.origin{ width:20px; height:20px; border-radius:10px; background-color:#000; position:absolute; top:190px; left:190px; z-index:14;}/* 日期 时间 */.date-info{ width:160px; height:28px; line-height:28px; text-align:center; position:absolute; top:230px; left:120px; z-index:11; color:#555; font-weight:bold; font-family:'微软雅黑';}.time-info{ width:92px; height:30px; line-height:30px; text-align:center; position:absolute; top:270px; left:154px; z-index:11; background-color:#555; padding:0; box-shadow:0px 0px 9px 2px #222 inset;}.time{ width:30px; height:30px; text-align:center; float:left; color:#fff; font-weight:bold;}#minute-time{ border-left:1px solid #fff; border-right:1px solid #fff;}/* 刻度 */.clock-scale{ width:195px; height:2px; transform-origin:0% 50%; z-index:7; position:absolute; top:199px; left:200px;}.scale-show{ width:12px; height:2px; background-color:#555; float:left;}.scale-hidden{ width:183px; height:2px; float:left;}javascript部分
js部分没什么好说的，简单的dom操作，setInterval函数每隔一秒执行一次，修改指针的角度和显示的时间即可。代码如下
(function(){ window.onload=initNumXY(200, 160, 40,40); var hour_line = document.getElementById("hour-line"); var minute_line = document.getElementById("minute-line"); var second_line = document.getElementById("second-line"); var date_info = document.getElementById("date-info"); var week_day = [ '星期日', '星期一', '星期二', '星期三', '星期四', '星期五', '星期六' ]; var hour_time = document.getElementById("hour-time"); var minute_time = document.getElementById("minute-time"); var second_time = document.getElementById("second-time"); function setTime(){ var this_day = new Date(); var hour = (this_day.getHours() >= 12) ? (this_day.getHours() - 12) : this_day.getHours(); var minute = this_day.getMinutes(); var second = this_day.getSeconds(); var hour_rotate = (hour*30-90) + (Math.floor(minute / 12) * 6); var year = this_day.getFullYear(); var month = ((this_day.getMonth() + 1) < 10 ) ? "0"+(this_day.getMonth() + 1) : (this_day.getMonth() + 1); var date = (this_day.getDate() < 10 ) ? "0"+this_day.getDate() : this_day.getDate(); var day = this_day.getDay(); hour_line.style.transform = 'rotate(' + hour_rotate + 'deg)'; minute_line.style.transform = 'rotate(' + (minute*6 - 90) + 'deg)'; second_line.style.transform = 'rotate(' + (second*6 - 90)+'deg)'; date_info.innerHTML = year + "-" + month + "-" + date + " " + week_day[day]; hour_time.innerHTML = (this_day.getHours() < 10) ? "0" + this_day.getHours() : this_day.getHours(); minute_time.innerHTML = (this_day.getMinutes() < 10) ? "0" + this_day.getMinutes() : this_day.getMinutes(); second_time.innerHTML = (this_day.getSeconds() < 10) ? "0" + this_day.getSeconds():this_day.getSeconds(); } setInterval(setTime, 1000); function initNumXY(R, r, w, h){ var numXY = [ { "left" : R + 0.5 * r - 0.5 * w, "top" : R - 0.5 * r * 1.73205 - 0.5 * h }, { "left" : R + 0.5 * r * 1.73205 - 0.5 * w, "top" : R - 0.5 * r - 0.5 * h }, { "left" : R + r - 0.5 * w, "top" : R - 0.5 * h }, { "left" : R + 0.5 * r * 1.73205 - 0.5 * w, "top" : R + 0.5 * r - 0.5 * h }, { "left" : R + 0.5 * r - 0.5 * w, "top" : R + 0.5 * r * 1.732 - 0.5 * h }, { "left" : R - 0.5 * w, "top" : R + r - 0.5 * h }, { "left" : R - 0.5 * r - 0.5 * w, "top" : R + 0.5 * r * 1.732 - 0.5 * h }, { "left" : R - 0.5 * r * 1.73205 - 0.5 * w, "top" : R + 0.5 * r - 0.5 * h }, { "left" : R - r - 0.5 * w, "top" : R - 0.5 * h }, { "left" : R - 0.5 * r * 1.73205 - 0.5 * w, "top" : R - 0.5 * r - 0.5 * h }, { "left" : R - 0.5 * r - 0.5 * w, "top": R - 0.5 * r * 1.73205 - 0.5 * h }, { "left" : R - 0.5 * w, "top" : R - r - 0.5 * h } ]; var clock = document.getElementById("clock"); for(var i = 1; i <= 12; i++){ if(i%3 == 0) { clock.innerHTML += "<div class='clock-num em_num'>"+i+"</div>"; } else { clock.innerHTML += "<div class='clock-num'>" + i + "</div>"; } } var clock_num = document.getElementsByClassName("clock-num"); for(var i = 0; i < clock_num.length; i++) { clock_num[i].style.left = numXY[i].left + 'px'; clock_num[i].style.top = numXY[i].top + 'px'; } for(var i = 0; i < 60; i++) { clock.innerHTML += "<div class='clock-scale'> " + "<div class='scale-hidden'></div>" + "<div class='scale-show'></div>" + "</div>"; } var scale = document.getElementsByClassName("clock-scale"); for(var i = 0; i < scale.length; i++) { scale[i].style.transform="rotate(" + (i * 6 - 90) + "deg)"; } }})();以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持武林网。
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