问不能用"for...in“循环为对象的属性赋值

EN

var cornersAbs = {
    topLeftCorner: { x: center.x + orin.corners.topLeft.x, y: center.y + orin.corners.topLeft.y, OOB: false },
    topRightCorner: { x: center.x + orin.corners.topRight.x, y: center.y + orin.corners.topRight.y, OOB: false },
    bottomLeftCorner: { x: center.x + orin.corners.bottomLeft.x, y: center.y + orin.corners.bottomLeft.y, OOB: false },
    bottomRightCorner:{ x: center.x + orin.corners.bottomRight.x, y: center.y + orin.corners.bottomRight.y, OOB: false }
}

for (var corner in cornersAbs) {
    corner.OOB = corner.x < 0 | corner.y < 0 | corner.x > canvas.width | corner.y > canvas.height;
}

for (var corner in cornersAbs) {
    cornersAbs.corner.OOB = cornersAbs.corner.x < 0 | cornersAbs.corner.y < 0 | cornersAbs.corner.x > canvas.width | cornersAbs.corner.y > canvas.height;
}