效果

一、创建Canvas

var mW = 400;
var mH = 400;
var mCtx = null;

var canvas = document.createElement('canvas');
document.body.appendChild(canvas);
canvas.height = mH;
canvas.width = mW;
mCtx = canvas.getContext('2d');

二、制作多边形背景

var mCount = 6; //边数
var mCenter = mW /2; //中心点
var mRadius = mCenter - 50; //半径(减去的值用于给绘制的文本留空间)
var mAngle = Math.PI * 2 / mCount; //角度
var mColorPolygon = '#B8B8B8'; //多边形颜色

// 绘制多边形边
function drawPolygon(ctx){
    ctx.save();

    ctx.strokeStyle = mColorPolygon;
    var r = mRadius/ mCount; //单位半径
    //画6个圈
    for(var i = 0; i < mCount; i ++){
        ctx.beginPath();        
        var currR = r * ( i + 1); //当前半径
        //画6条边
        for(var j = 0; j < mCount; j ++){
            var x = mCenter + currR * Math.cos(mAngle * j);
            var y = mCenter + currR * Math.sin(mAngle * j);

            ctx.lineTo(x, y);
        }
        ctx.closePath()
        ctx.stroke();
    }

    ctx.restore();
}

效果：

三、连接顶点线

var mColorLines = '#B8B8B8'; //顶点连线颜色

//顶点连线
function drawLines(ctx){
    ctx.save();

    ctx.beginPath();
    ctx.strokeStyle = mColorLines;

    for(var i = 0; i < mCount; i ++){
        var x = mCenter + mRadius * Math.cos(mAngle * i);
        var y = mCenter + mRadius * Math.sin(mAngle * i);

        ctx.moveTo(mCenter, mCenter);
        ctx.lineTo(x, y);
    }

    ctx.stroke();

    ctx.restore();
}

效果：

四、绘制数据文本

var mData = [['速度', 77],
            ['力量', 72],
            ['防守', 46],
            ['射门', 50],
            ['传球', 80],
            ['耐力', 60]]; //数据
var mColorText = '#000000';

//绘制文本
function drawText(ctx){
    ctx.save();

    var fontSize = mCenter / 12;
    ctx.font = fontSize + 'px Microsoft Yahei';
    ctx.fillStyle = mColorText;

    for(var i = 0; i < mCount; i ++){
        var x = mCenter + mRadius * Math.cos(mAngle * i);
        var y = mCenter + mRadius * Math.sin(mAngle * i);

        //通过不同的位置，调整文本的显示位置
        if( mAngle * i >= 0 && mAngle * i <= Math.PI / 2 ){
            ctx.fillText(mData[i][0], x, y + fontSize); 
        }else if(mAngle * i > Math.PI / 2 && mAngle * i <= Math.PI){
            ctx.fillText(mData[i][0], x - ctx.measureText(mData[i][0]).width, y + fontSize);    
        }else if(mAngle * i > Math.PI && mAngle * i <= Math.PI * 3 / 2){
            ctx.fillText(mData[i][0], x - ctx.measureText(mData[i][0]).width, y);   
        }else{
            ctx.fillText(mData[i][0], x, y);
        }

    }

    ctx.restore();
}

效果：

五、绘制数据覆盖区域

//绘制数据区域
function drawRegion(ctx){
    ctx.save();

    ctx.beginPath();
    for(var i = 0; i < mCount; i ++){
        var x = mCenter + mRadius * Math.cos(mAngle * i) * mData[i][1] / 100;
        var y = mCenter + mRadius * Math.sin(mAngle * i) * mData[i][1] / 100;

        ctx.lineTo(x, y);
    }
    ctx.closePath();
    ctx.fillStyle = 'rgba(255, 0, 0, 0.5)';
    ctx.fill();

    ctx.restore();
}

效果：

六、绘制数据点

把每个数据与线的焦点绘制出来。

//画点
function drawCircle(ctx){
    ctx.save();

    var r = mCenter / 18;
    for(var i = 0; i < mCount; i ++){
        var x = mCenter + mRadius * Math.cos(mAngle * i) * mData[i][1] / 100;
        var y = mCenter + mRadius * Math.sin(mAngle * i) * mData[i][1] / 100;

        ctx.beginPath();            
        ctx.arc(x, y, r, 0, Math.PI * 2);
        ctx.fillStyle = 'rgba(255, 0, 0, 0.8)';
        ctx.fill();
    }       

    ctx.restore();
}

效果：

效果演示

最终代码

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <style type="text/css">
    canvas{
    }
  </style>
</head>
<body>
<script type="text/javascript"> 
    var mW = 400;
    var mH = 400;
    var mData = [['速度', 77],
                            ['力量', 72],
                            ['防守', 46],
                            ['射门', 50],
                            ['传球', 80],
                            ['耐力', 60]];
    var mCount = mData.length; //边数 
    var mCenter = mW /2; //中心点
    var mRadius = mCenter - 50; //半径(减去的值用于给绘制的文本留空间)
    var mAngle = Math.PI * 2 / mCount; //角度
    var mCtx = null;
    var mColorPolygon = '#B8B8B8'; //多边形颜色
    var mColorLines = '#B8B8B8'; //顶点连线颜色
    var mColorText = '#000000';

    //初始化
    (function(){
      var canvas = document.createElement('canvas');
      document.body.appendChild(canvas);
      canvas.height = mH;
      canvas.width = mW;
      mCtx = canvas.getContext('2d');

      drawPolygon(mCtx);
      drawLines(mCtx);
      drawText(mCtx);
      drawRegion(mCtx);
      drawCircle(mCtx);
    })();

      // 绘制多边形边
      function drawPolygon(ctx){
        ctx.save();

        ctx.strokeStyle = mColorPolygon;
        var r = mRadius/ mCount; //单位半径
        //画6个圈
        for(var i = 0; i < mCount; i ++){
            ctx.beginPath();        
            var currR = r * ( i + 1); //当前半径
            //画6条边
            for(var j = 0; j < mCount; j ++){
                var x = mCenter + currR * Math.cos(mAngle * j);
                var y = mCenter + currR * Math.sin(mAngle * j);

                ctx.lineTo(x, y);
            }
            ctx.closePath()
            ctx.stroke();
        }

        ctx.restore();
      }

    //顶点连线
    function drawLines(ctx){
        ctx.save();

        ctx.beginPath();
        ctx.strokeStyle = mColorLines;

        for(var i = 0; i < mCount; i ++){
            var x = mCenter + mRadius * Math.cos(mAngle * i);
            var y = mCenter + mRadius * Math.sin(mAngle * i);

            ctx.moveTo(mCenter, mCenter);
            ctx.lineTo(x, y);
        }

        ctx.stroke();

        ctx.restore();
    }

    //绘制文本
    function drawText(ctx){
        ctx.save();

        var fontSize = mCenter / 12;
        ctx.font = fontSize + 'px Microsoft Yahei';
        ctx.fillStyle = mColorText;

        for(var i = 0; i < mCount; i ++){
            var x = mCenter + mRadius * Math.cos(mAngle * i);
            var y = mCenter + mRadius * Math.sin(mAngle * i);

            if( mAngle * i >= 0 && mAngle * i <= Math.PI / 2 ){
                ctx.fillText(mData[i][0], x, y + fontSize); 
            }else if(mAngle * i > Math.PI / 2 && mAngle * i <= Math.PI){
                ctx.fillText(mData[i][0], x - ctx.measureText(mData[i][0]).width, y + fontSize);    
            }else if(mAngle * i > Math.PI && mAngle * i <= Math.PI * 3 / 2){
                ctx.fillText(mData[i][0], x - ctx.measureText(mData[i][0]).width, y);   
            }else{
                ctx.fillText(mData[i][0], x, y);
            }

        }

        ctx.restore();
    }

    //绘制数据区域
    function drawRegion(ctx){
        ctx.save();

        ctx.beginPath();
        for(var i = 0; i < mCount; i ++){
            var x = mCenter + mRadius * Math.cos(mAngle * i) * mData[i][1] / 100;
            var y = mCenter + mRadius * Math.sin(mAngle * i) * mData[i][1] / 100;

            ctx.lineTo(x, y);
        }
        ctx.closePath();
        ctx.fillStyle = 'rgba(255, 0, 0, 0.5)';
        ctx.fill();

        ctx.restore();
    }

    //画点
    function drawCircle(ctx){
        ctx.save();

        var r = mCenter / 18;
        for(var i = 0; i < mCount; i ++){
            var x = mCenter + mRadius * Math.cos(mAngle * i) * mData[i][1] / 100;
            var y = mCenter + mRadius * Math.sin(mAngle * i) * mData[i][1] / 100;

            ctx.beginPath();            
            ctx.arc(x, y, r, 0, Math.PI * 2);
            ctx.fillStyle = 'rgba(255, 0, 0, 0.8)';
            ctx.fill();
        }       

        ctx.restore();
    }
</script>

</body>
</html>

代码下载：点击这里

博客名称：王乐平博客

CSDN博客地址：http://blog.csdn.net/lecepin