function pointInPolygon(point, polygon) {
var x = point[0];
var y = point[1];
var inside = false;
for (var i = 0, j = polygon.length - 1; i < polygon.length; j = i++) {
var xi = polygon[i][0];
var yi = polygon[i][1];
var xj = polygon[j][0];
var yj = polygon[j][1];
var intersect = ((yi > y) != (yj > y)) && (x < (xj - xi) * (y - yi) / (yj - yi) + xi);
if (intersect) inside = !inside;
}
return inside;
}
// 使用示例
var pointA = [1, 1];
var polygonB = [[0, 0], [0, 2], [2, 2], [2, 0]];
var result = pointInPolygon(pointA, polygonB);
console.log(result); // 输出 true 或 false
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