Javascript:创建循环来检查变量是否为 int

Question

我有一个提示问题的变量。我想确保对方回答的是数字而不是“五”。但也要发出警告消息，表明该号码无效，并再次询问问题。我还是个新手，相信我做错了。这是我到目前为止所拥有的。

var question = prompt("Enter a number");
for(i=0; i = question; i++){
    if{
        typeof question != "number");
        console.log("question not number");
        alert("Please try again");
}

Answer 1

您可以创建一个提出问题的函数。如果答案不满足您，您可以再次调用该函数本身。

var askQuestion = function() {
    var response = prompt("Enter a number");

    // if it is good, return true (insert your condition in the if)
    if(true) {
        return true;
    }
    // If it is not good, recall the function, so it recall the question
    else {
        return askQuestion();
    }
}

然后在您的代码中执行如下操作:

if(askQuestion()) {
    // The person answered what you want
} 
// There is no else because it prompt the question all the time 
// if the answer is not what you are excepting