开始创建一个路径，需要调用 fill 或者 stroke 才会使用路径进行填充或描边。
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Page({
onLoad() {
const canvasContext = swan.createCanvasContext('myCanvas');
canvasContext.beginPath();
canvasContext.setLineWidth(5);
canvasContext.setStrokeStyle('blue');
canvasContext.moveTo(0, 75);
canvasContext.lineTo(250, 75);
canvasContext.stroke();
canvasContext.beginPath();
canvasContext.setStrokeStyle('red');
canvasContext.moveTo(50, 0);
canvasContext.lineTo(150, 130);
canvasContext.stroke();
canvasContext.draw();
}
});