根据数组检查输入变量

Checking input variables against array

本文关键字：输入 变量 检查 数组      更新时间：2023-09-26

正在尝试根据我的数组（sportsArray）检查输入变量（sGuess）...

var 名称工作正常

然后，当我让它检查用户针对数组（sportsArray）输入的变量（sGuess）时，我总是在控制台中得到以下内容。循环 1 返回 NaN循环 2 返回未定义循环 3 完美返回其输入

我正在使用以下JavaScript代码 

  var sportsArray = new Array("Football", "Basketball", "Rollerblading", "Hiking", "Biking", "Swimming");
  var name;
  var score;
  var loops;
  var sGuess;
// prompts for user name, checks input.
do {
name = prompt("Enter your first name");
}
while (name == "");

// loop for guesses.
for (var i = 1; i <4; i++) {
// prompts user for guess.
sGuess = prompt("Enter your sports guess");

if(sportsArray.indexOf(sGuess) == -1) {
    alert("Sorry! Guess Again.");
    score -= 5;
}
else {
    alert("You are good, try it again!");
    score += 5;
}
 }

如何修复循环 1 和 2 返回错误？

嘿 你必须先初始化一个变量：

var sportsArray = new Array("Football", "Basketball", "Rollerblading", "Hiking", "Biking", "Swimming");
var name;
var score;
var loops;
var sGuess;
// prompts for user name, checks input.
do {
 name = prompt("Enter your first name");
}
while (name == "");
// loop for guesses.
for (var i = 1; i < 4; i++) {
 // prompts user for guess.
 sGuess = prompt("Enter your sports guess");
var s = sportsArray.indexOf(sGuess);
 if (s == -1) {
   alert("Sorry! Guess Again.");
   score -= 5;
 } else {
   alert("You are good, try it again!");
   score += 5;
 }
}
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