javascript - 石头剪刀布程序的 if 语句有问题

Question

每当我运行以下代码时，我总是收到“你选择了石头，你选择了布，你选择了剪刀”，我不知道为什么。

//if they haven't picked 1, 2, or 3, ask for input until they do

while (userSELECT != 1 && userSELECT != 2 && userSELECT != 3) {
  var userSELECT = prompt("1 = Rock | 2 = Paper | 3 = Scissors", "<>");
};

// 1 is rock
if (userSELECT = '1') {
  console.log("you chose Rock")
};

// 2 is paper
if (userSELECT = '2') {
  console.log("you chose Paper")
};

// 3 is scissors
if (userSELECT = '3') {
  console.log("you chose Scissors")
};

Answer 1

= 用于设置值而不是用于比较，因此您应该使用 == 而不是 =:

//if they haven't picked 1, 2, or 3, ask for input until they do

while (userSELECT != 1 && userSELECT != 2 && userSELECT != 3) {
  var userSELECT = prompt("1 = Rock | 2 = Paper | 3 = Scissors", "<>");
};

// 1 is rock
if (userSELECT == '1') {
  console.log("you chose Rock")
};

// 2 is paper
if (userSELECT == '2') {
  console.log("you chose Paper")
};

// 3 is scissors
if (userSELECT == '3') {
  console.log("you chose Scissors")
};