javascript - if语句出现问题，用于剪刀石头布程序

每当我运行以下代码时，我都会不断收到“您选择了石头，您选择了纸，您选择了剪刀”，但我不知道为什么。

//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")
};

最佳答案

=用于设置值，而不是用于比较，因此应使用==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")
};

关于javascript - if语句出现问题，用于剪刀石头布程序，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/61613585/