javascript - 验证来自 prompt() 的响应。再次提示无效响应

Question

我想这样做，如果用户不输入“1”或“2”，则必须重新回答问题。我尝试了 prompt{choice1}; 但它不起作用。

有什么解决办法吗？

var choice1 = prompt("You see a bear on your campsite, What do you do ? Type 1 if you start running into the woods or type 2 if you fight the bear.");

if (choice1 == "1") {

  for (var i = 2; i < 3; i++) {
    alert("You start running into the woods. You stop, Out of breathe and realize you somehow got cut in your left arm.");
  }

} else if (choice1 == "2") {

  for (var b = 0; b < 1; b++) {
    alert("You look around you to find something that could help you fight off the bear. You see a rock and you pick it up. The bear is getting ready to attack and right away you throw the rock");
  }

} else {}

Answer 1

Working fiddle

使用 do..while 循环:

do {
  var choice1 = prompt("You see a bear on your campsite, What do you do ? Type 1 if you start running into the woods or type 2 if you fight the bear.");

  if (choice1 == "1") {

    for (var i = 2; i < 3; i++) {
      alert("You start running into the woods. You stop, Out of breathe and realize you somehow got cut in your left arm.");
    }

  } else if (choice1 == "2") {

    for (var b = 0; b < 1; b++) {
      alert("You look around you to find something that could help you fight off the bear. You see a rock and you pick it up. The bear is getting ready to attack and right away you throw the rock");
    }

  }
}
while (choice1 != "1" && choice1 != "2");

希望这对您有所帮助。