Canvas的矩形、虚线、虚线矩形、画笔颜色函数封装

如题。封装了几个canvas的函数，有需要的话可以直接用。

直接上代码：

canvas画笔颜色封装：

            //画笔颜色
            function contextColor(color, context) {
                context ? context : context = ctx;
                if (color == 1) {
                    context.strokeStyle = "#00FF00"; //green
                } else if (color == 2) {
                    // context.strokeStyle = "#0000FF"; //blue
                    context.strokeStyle = "#00FFFF"; //AQUA
                } else if (color == 3) {
                    context.strokeStyle = "#FFFF00"; //yellow
                } else if (color >= 4 && color <= 6) {
                    context.strokeStyle = "#FFFFFF"; //WHITE
                } else if (color == 7) {
                    context.strokeStyle = "#FF0000"; //red
                } else if (isNaN) {
                    context.strokeStyle = color ? color : context.strokeStyle = "#FF00FF"; //FUCHSIA
                }
            }

canvas画矩形：

            //画方框
            function drawstrokeRect(x, y, w, h, color) {
                contextColor(color);
                ctx.strokeRect(x, y, w, h);
            }

canvas画虚线：

            //虚线直线
            function drawDashLine(starX, starY, endX, endY, step) {
                ctx.beginPath();
                ctx.moveTo(starX, starY);
                ctx.setLineDash([step ? step : 5]);
                ctx.lineWidth = 2;
                ctx.lineTo(endX, endY);
                ctx.stroke();
            }

canvas画虚线矩形：

            //虚线矩形
            function drawDashRect(x, y, w, h, color) {
                contextColor(color);
                drawDashLine(x, y, (x + w), y);
                drawDashLine((x + w), y, (x + w), (y + h));
                drawDashLine(x, y, x, (y + h));
                drawDashLine(x, (y + h), (x + w), (y + h));
            }