数学还勉强管用，用代码还能画个canvas 仪表盘(含完整代码)

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>仪表盘</title>

    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no, minimal-ui">

    <meta name="apple-mobile-web-app-capable" content="yes">

 </head>

 <style type="text/css">

    body{margin:20px auto; padding:0; width:800px; }

    /*canvas{border:dashed 2px #CCC}*/

 </style>

 <script type="text/javascript">

    var canid;

    function $$(id){

        return document.getElementById(id);

    }

    function pageLoad(){

        var can = $$(canid);

        var cans = can.getContext('2d');

        cans.beginPath();

        cans.arc(400,300,180,-10,0,false);

        //cans.closePath();

        cans.strokeStyle = 'red';

        cans.fillStyle = "blue";

        cans.lineWidth = 30;

        cans.stroke();

        cans.beginPath();

        cans.arc(400,300,90,0,4/3*Math.PI,true);

        //cans.closePath();

        cans.strokeStyle = 'red';

        cans.fillStyle = "blue";

        cans.lineWidth = 10;

        cans.fill();

        //cans.beginPath();

        //cans.arc(400,300,90,0,Math.PI,2);

        //cans.closePath();

        //cans.strokeStyle = 'blue';

        //cans.lineWidth = 80;

        //cans.stroke();

    }

    function pageLoad2(a,b,c,d,e,f,g){

        var can = $$(canid);

        var cans = can.getContext('2d');

        cans.beginPath();

        cans.arc(a,b,c,d,e,f);

        cans.strokeStyle = g;

        cans.fillStyle = g;

        cans.lineWidth = 30;

        cans.stroke();

        cans.font = "bold 30px Arial";

        cans.fillStyle = g;

    }

    function Drawarc(yuanxinx,yuanxiny, banjing, value, dengfen){

        var can = $$(canid);

        var cans = can.getContext('2d');

        cans.beginPath();

        cans.arc(yuanxinx,yuanxiny,banjing,(Math.PI*2)*(180/360),(Math.PI*2)*(((180/dengfen)*value+178)/360),false);

        var yanse;

        if (value<=7)

            yanse = '#81d135';

        if (value>7 && value<=14)

            yanse = '#fdc159';

        if (value>14)

            yanse = '#fb6376';

        cans.strokeStyle = yanse;

        cans.fillStyle = yanse;

        cans.lineWidth = 2;

        cans.stroke();

        cans.font = "bold 30px Arial";

        cans.fillStyle = yanse;

    }

    function Square(x)

    {

        return x*x;

    }

    function DrawLine(x1,y1,x2,y2)

    {

        var can = $$(canid);

        var cans = can.getContext('2d');

        cans.strokeStyle='#000';

        cans.lineWidth=1;

        //cans.lineCap='square';

        cans.beginPath();

        cans.moveTo(x1,y1);

        cans.lineTo(x2,y2);

        cans.stroke();

        //cans.closePath();

    }

    function Drawarc1(yuanxinx,yuanxiny, banjing, value, dengfen){

        var can = $$(canid);

        var cans = can.getContext('2d');

        cans.beginPath();

        var jiaodu = 180 - (180/dengfen)*value;

        var jiaodu1 = jiaodu-1.8;

        var jiaodu2 = jiaodu+1.8;

        var x1 = yuanxinx + banjing * Math.cos((jiaodu * 3.14)/180.0);

        var y1 = yuanxiny - banjing * Math.sin((jiaodu * 3.14)/180.0);

        var jiaodian1x = yuanxinx + banjing * Math.cos((jiaodu1 * 3.14)/180.0);

        var jiaodian1y = yuanxiny - banjing *Math.sin((jiaodu1 * 3.14)/180.0);

        var jiaodian2x = yuanxinx + banjing * Math.cos((jiaodu2 * 3.14)/180.0);

        var jiaodian2y = yuanxiny - banjing *Math.sin((jiaodu2 * 3.14)/180.0);

        //缩短短半径

        //alert(x1 +','+ y1);

        var sdbanjing = banjing -20;

        var jiaodian3x = yuanxinx + sdbanjing *Math.cos((jiaodu * 3.14)/180.0);

        var jiaodian3y = yuanxiny - sdbanjing *Math.sin((jiaodu * 3.14)/180.0);

        var jcbanjing = banjing +6;

        var jiaodian4x = yuanxinx + jcbanjing *Math.cos((jiaodu * 3.14)/180.0);

        var jiaodian4y = yuanxiny - jcbanjing *Math.sin((jiaodu * 3.14)/180.0);

        //alert(jiaodian3x +','+ jiaodian3y);

        DrawLine(jiaodian1x,jiaodian1y, jiaodian3x, jiaodian3y);

        DrawLine(jiaodian2x,jiaodian2y, jiaodian3x, jiaodian3y);

        //DrawLine(jiaodian1x,jiaodian1y, jiaodian4x, jiaodian4y);

        //DrawLine(jiaodian2x,jiaodian2y, jiaodian4x, jiaodian4y);

        cans.arc(x1,y1,4,0,Math.PI*2,false);

        var yanse;

        if (value<=7)

            yanse = '#81d135';

        if (value>7 && value<=14)

            yanse = '#fdc159';

        if (value>14)

            yanse = '#fb6376';

        cans.strokeStyle = yanse;

        cans.fillStyle = yanse;

        cans.lineWidth = 2;

        cans.stroke();

        //(a^2 + c^2 - b^2) / (2·a·c)

        var jiajiao = Math.round( Math.acos( (Square(banjing)+ Square(banjing) - Square(4)) / (2*banjing*banjing) ) * 180/Math.PI );

        //alert(jiajiao);

    }

    function Drawscaleline(yuanxinx,yuanxiny, banjing, kaishijd, jieshujd, dengfen, yanse)

    {

        var can = $$(canid);

        var cans = can.getContext('2d');

        for (var i=0;i<dengfen;i++)

        {

            dfjd = ((jieshujd - kaishijd)/dengfen)*i;

            cans.beginPath();

            cans.arc(yuanxinx,yuanxiny,banjing, (Math.PI*2)*((kaishijd+dfjd)/360),(Math.PI*2)*((kaishijd+dfjd+1)/360),false);

            cans.strokeStyle = yanse;

            cans.lineWidth = 20;

            cans.stroke();

        }

    }

    function DrawText(yuanxinx,yuanxiny, banjing, jiaodu, text, g)

    {

        var can = $$(canid);

        var cans = can.getContext('2d');

        cans.font = "bold 10px Arial";

        cans.strokeStyle = g;

        cans.fillStyle = g;

        var jcbanjing = banjing -15;

        x1 = yuanxinx + jcbanjing * Math.cos((jiaodu * Math.PI)/180.0);

        //if (jiaodu>90)

        //    x1 = x1 +10;

        //else

        //    x1 = x1-18;

        y1   =  yuanxiny - jcbanjing *Math.sin((jiaodu * Math.PI)/180.0);

        cans.fillText(text,x1,y1);

    }

    function dashboard(id)

    {

        canid = id;

        var can = $$(canid);

        var banjing = (can.width/2);

        var yuanxinx = can.width/2;

        var yuanxiny = can.height;

        var cans = can.getContext('2d');

        pageLoad2(yuanxinx,yuanxiny,banjing-40,(Math.PI*2)*(180/360),(Math.PI*2)*(240/360),false,'#81d135');

        pageLoad2(yuanxinx,yuanxiny,banjing-40,(Math.PI*2)*(240/360),(Math.PI*2)*(300/360),false,'#fdc159');

        pageLoad2(yuanxinx,yuanxiny,banjing-40,(Math.PI*2)*(300/360),(Math.PI*2)*(360/360),false,'#fb6376');

        Drawscaleline(yuanxinx,yuanxiny,banjing-40,180,240,6, '#6db52b');

        Drawscaleline(yuanxinx,yuanxiny,banjing-40,240,300,6, '#f4bd5f');

        Drawscaleline(yuanxinx,yuanxiny,banjing-40,300,361,6, '#ef5469');

        Drawarc(yuanxinx,yuanxiny,banjing-62,12,21);

        Drawarc1(yuanxinx,yuanxiny,banjing-62,12,21);

        DrawText(yuanxinx,yuanxiny,banjing,180, '0', '#81d135');

        DrawText(yuanxinx,yuanxiny,banjing,120, '7', '#fdc159');

        DrawText(yuanxinx,yuanxiny,banjing,60, '14', '#fdc159');

        DrawText(yuanxinx,yuanxiny,banjing,0, '21', '#fb6376');

        //cans.scale(0.2, 0.2);

    }

    function load()

    {

        dashboard('can');

        dashboard('can1');

    }

 </script>

<body onload="load();" style="width:100%">

    <canvas id="can" width="414px" height="310px"></canvas>

    <canvas id="can1" width="414px" height="310px"></canvas>

</body>

</html>

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数学还勉强管用，用代码还能画个canvas 仪表盘(含完整代码)

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