如何将isPointInPath()应用于多个路径

var canvas = document.createElement('canvas');
var ctx = canvas.getContext('2d');

ctx.beginPath();
ctx.moveTo(50, 50);
ctx.lineTo(100, 100);
ctx.lineTo(150, 50);
ctx.closePath();

ctx.beginPath();
ctx.arc(200, 75, 50, 0, 2 * Math.PI);
ctx.closePath();

var pointX = 100;
var pointY = 75;

var isPointInPath1 = ctx.isPointInPath(pointX, pointY);

var pointX2 = 200;
var pointY2 = 75;

var isPointInPath2 = ctx.isPointInPath(pointX2, pointY2);

if (isPointInPath1) {
  console.log("点(" + pointX + ", " + pointY + ")在路径1中");
} else {
  console.log("点(" + pointX + ", " + pointY + ")不在路径1中");
}

if (isPointInPath2) {
  console.log("点(" + pointX2 + ", " + pointY2 + ")在路径2中");
} else {
  console.log("点(" + pointX2 + ", " + pointY2 + ")不在路径2中");
}