javascript - 输入验证 JavaScript？

Question

我需要向用户询问提示，但他们只能输入某些单词才能接受答案，如果用户没有用正确的单词回答，则会说它无效并再次询问问题。< br/> 这必须仅使用 JavaScript 来完成。

var entering = confirm('Confirm to add state or territory');
if (!entering) {
    return;
} else {
    while (true) {
        stInput = prompt('Enter state or territory');

        function validateUserChoice(stInput) {
            if (stInput !== "Queensland" && stInput !== "New South Wales" && stInput !== "Victoria" && stInput !== "Tasmania" && stInput !== "Northern Territory" && stInput !== "Western Australia" && stInput !== "South Australia" && stInput !== "Australian Capital Territory") {
                alert("invalid state or territory");
            } else {
                return false;
            }
        }
        populationInput = parseInt(prompt('Enter population for ' + stInput + ''));

        while (isNaN(populationInput)) {
            alert('Your input was invalid');
            populationInput = parseInt(prompt('Enter population for ' + stInput + ''));
        }
        changeInput = parseFloat(prompt('Enter growth rate for ' + populationInput + ''));

        while (isNaN(changeInput)) {
            alert('Your input was invalid');
            changeInput = parseFloat(prompt('Enter growth rate for ' + populationInput + ''));
        }

        break;
    }

}

这是我到目前为止所做的，但它没有验证，所以我做错了一些事情，只是不确定是什么。

用户只能回答的词有:昆士兰、新南威尔士、维多利亚、塔斯马尼亚 、北领地、西澳大利亚、南澳大利亚、澳大利亚首都领地。

Answer 1

当您编写function validateUserChoice(stInput)时，您是在声明一个函数，而不是调用它。因此，您应该声明您的函数并将其调用为 validateUserChoice(stInput) 还是根本不使用函数。

按照一段代码，我相信您打算这样做:

    var entering = confirm('Confirm to add state or territory');
    if (!entering) {
      return;
    } else {
      stInput = prompt('Enter state or territory');
      while (stInput !== "Queensland" && stInput !== "New South Wales" && stInput !== "Victoria" && stInput !== "Tasmania" && stInput !== "Northern Territory" && stInput !== "Western Australia" && stInput !== "South Australia" && stInput !== "Australian Capital Territory") {
        //stay in loop while stInput is not equal any of the strings
        alert("invalid state or territory");
        stInput = prompt('Enter state or territory');
      }
      populationInput = parseInt(prompt('Enter population for ' + stInput + ''));

      while(isNaN(populationInput)) {
        alert('Your input was invalid');
        populationInput = parseInt(prompt('Enter population for ' + stInput + ''));
      }
      changeInput = parseFloat(prompt('Enter growth rate for ' + populationInput + ''));

      while(isNaN(changeInput)) {
        alert('Your input was invalid');
        changeInput = parseFloat(prompt('Enter growth rate for ' + populationInput + ''));
      }
    }