乘法（*）

console.log(3 * 4);
// Expected output: 12

console.log(-3 * 4);
// Expected output: -12

console.log("3" * 2);
// Expected output: 6

console.log("foo" * 2);
// Expected output: NaN

x * y

2 * 2; // 4
-2 * 2; // -4

Infinity * 0; // NaN
Infinity * Infinity; // Infinity

"foo" * 2; // NaN