canvas实现钟表效果_H5之家 - 中国HTML5教程资源分享第一站

小编推荐的这篇文章介绍了canvas实现钟表效果的实例代码，实现后效果非常酷炫，有兴趣的快看看吧。

效果如下：

代码如下：

代码如下复制代码

<!DOCTYPE html>

<html>

<head>

<metacharset="UTF-8">

<title>canvas画钟表</title>

<style>

body{

background: #fc0;

}

#canvas1{

background: #fff;

}

</style>

</head>

<body>

<canvasid="canvas1"width="400"height="400"></canvas>

var oC=document.getElementById('canvas1');

var oGC=oC.getContext('2d');

function toDraw(){

var x=200;

var y=200;

var r=150;

oGC.clearRect(0,0,oC.width,oC.height);

var oDate=new Date();

var oHour=oDate.getHours();

var oMinu=oDate.getMinutes();

var oSec=oDate.getSeconds();

var hVal=(-90+oHour*30+oMinu/2)*Math.PI/180;

var mVal=(-90+oMinu*6)*Math.PI/180;

var sVal=(-90+oSec*6)*Math.PI/180;

oGC.beginPath();

for(i=0;i<60;i++){

oGC.moveTo(x,y);

oGC.arc(x,y,r,6*i*Math.PI/180,6*(i+1)*Math.PI/180,false);

}

oGC.closePath();

oGC.stroke();

oGC.fillStyle='#fff';

oGC.beginPath();

oGC.moveTo(x,y);

oGC.arc(x,y,r*19/20,0,360*Math.PI/180,false);

oGC.closePath();

oGC.fill();

oGC.lineWidth=3;

oGC.beginPath();

for(i=0;i<12;i++){

oGC.moveTo(x,y);

oGC.arc(x,y,r,30*i*Math.PI/180,30*(i+1)*Math.PI/180,false);

}

oGC.closePath();

oGC.stroke();

oGC.fillStyle='#fff';

oGC.beginPath();

oGC.moveTo(x,y);

oGC.arc(x,y,r*18/20,0,360*Math.PI/180,false);

oGC.closePath();

oGC.fill();

oGC.lineWidth=5;

oGC.beginPath();

oGC.moveTo(x,y);

oGC.arc(x,y,r*10/20,hVal,hVal,false);

oGC.closePath();

oGC.stroke();

oGC.lineWidth=3;

oGC.beginPath();

oGC.moveTo(x,y);

oGC.arc(x,y,r*14/20,mVal,mVal,false);

oGC.closePath();

oGC.stroke();

oGC.lineWidth=1;

oGC.beginPath();

oGC.moveTo(x,y);

oGC.arc(x,y,r*17/20,sVal,sVal,false);

oGC.closePath();

oGC.stroke();

}

setInterval(toDraw,1000);

toDraw();

</script>

</body>

</html>

没有了

小编推荐的这篇文章介绍了Mybatis结果生成键值对的实例代码，非常实用，有兴趣的同学快来看看吧。

在实际应用中我们经常会遇到这样的情况，需要给下拉框赋值，这个时候就需要键值对了，具体使用方法如下

1，在maper.xml文件中定义结果类型(resultType)定义为hashmap,如下所示

代码如下复制代码

SELECT unit_id ,unit_name from unit_info

</select>

2，在对应的mapper类中用List<Map<String,String>>来接受这个类型，如下所示

代码如下复制代码

publicList<Map<String,String>> selectSuperUnitInfo();

其实最强大的莫过于resultMap类型了，这个可以在mapper.xml文件中自定义扩展类型，然后在包中添加这个类型即可，真是强大

下面给大家补充下MyBatis返回Map键值对数据

代码如下复制代码

List<Map<String, String>> getMtypeList();

select code,`name` from jk_control_measure

</select>

[DEBUG]2016-08-2917:50:09:==> Executing: select code,`name` from jk_control_measure

[DEBUG]2016-08-2917:50:09:==> Parameters:

[DEBUG]2016-08-2917:50:10:<== Columns: code, name

[DEBUG]2016-08-2917:50:10:<== Row: one, 地面冲洗

[DEBUG]2016-08-2917:50:10:<== Row: two, 边界围挡

[DEBUG]2016-08-2917:50:10:<== Row: three, 垃圾覆盖

[DEBUG]2016-08-2917:50:10:<== Row: four, 裸地覆盖

[DEBUG]2016-08-2917:50:10:<== Row: five, 洒水降尘

[DEBUG]2016-08-2917:50:10:<== Row: six, 车辆冲洗

[DEBUG]2016-08-2917:50:10:<== Row: seven, 建筑渣土

[DEBUG]2016-08-2917:50:10:<== Row: eight, 车辆冒装

[DEBUG]2016-08-2917:50:10:<== Row: nine, 扬尘覆盖

[DEBUG]2016-08-2917:50:10:<== Row: ten, 车辆撒漏

[DEBUG]2016-08-2917:50:10:<== Row: eleven, 车辆黑烟

[DEBUG]2016-08-2917:50:10:<== Row: twelve, 道路积尘<br>

[{"NAME":"地面冲洗","name":"地面冲洗","code":"one","CODE":"one"},

{"NAME":"边界围挡","name":"边界围挡","code":"two","CODE":"two"},

{"NAME":"垃圾覆盖","name":"垃圾覆盖","code":"three","CODE":"three"},

{"NAME":"裸地覆盖","name":"裸地覆盖","code":"four","CODE":"four"},

{"NAME":"洒水降尘","name":"洒水降尘","code":"five","CODE":"five"},

{"NAME":"车辆冲洗","name":"车辆冲洗","code":"six","CODE":"six"},

{"NAME":"建筑渣土","name":"建筑渣土","code":"seven","CODE":"seven"},

{"NAME":"车辆冒装","name":"车辆冒装","code":"eight","CODE":"eight"},

{"NAME":"扬尘覆盖","name":"扬尘覆盖","code":"nine","CODE":"nine"},

{"NAME":"车辆撒漏","name":"车辆撒漏","code":"ten","CODE":"ten"},

{"NAME":"车辆黑烟","name":"车辆黑烟","code":"eleven","CODE":"eleven"},

{"NAME":"道路积尘","name":"道路积尘","code":"twelve","CODE":"twelve"}

]

返回的结果带有大写与小写的key

没有了