js实现时钟代码

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代码

<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style>
/* 全局 */
*{ 

margin:0;
padding:0;
}
.clock{ 

width:400px;
height:400px;
border:10px solid #333;
box-shadow: 0 0 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';
}
/* 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:199px;
left:180px;
background-color:#f60;
transform-origin:11.765% 50%;
box-shadow:1px -3px 7px 1px #bbb;
}
</style>
</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>
</div>
<script>
(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 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)";
}
}
})();
</script>
</body>
</html>