为什么我在 </script> 上收到错误消息？错误是（未捕获的语法错误：输入意外结束）答案

【问题标题】：Why am I receiving an error on </script> ? the error is (Uncaught SyntaxError: Unexpected end of input)为什么我在 </script> 上收到错误消息？错误是（未捕获的语法错误：输入意外结束）
【发布时间】：2020-02-26 01:47:05
【问题描述】：

基本上，我正在尝试创建一个运输履行程序，但我遇到了一个我无法自行调试的错误。谢谢大家。

<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title></title>
  </head>
  <body>
        <script type="text/javascript">
            var totalPrice = 0;
            var totalVolume = 0;
            var totalItem = 0;
            var numTrucks = 0;
            var productArray = ["LT","ST","DC","LC","PR","SP","SW"]; // 0 1 2 3 4 5 6
            var shippingvolumeArray = ["5.5","3","3.25","2","2.5","0.5","0.25"];
            var unitpriceArray = [1000,600,650,800,375,350,275];
            var productCode = Number(prompt("enter product code:"));
            var Quantity = prompt("enter quantity");

            do {
                var productCode = prompt("enter product code:");
                var Quantity = prompt("enter quantity:");
                for (var i = 0; i<= productArray.length; i++) {
                    if (productCode == productArray[i]) {
                        totalPrice = totalPrice + unitpriceArray[i] * Quantity;
                        totalVolume = totalVolume + shippingvolumeArray[i] + Quantity;
                        totalItem = totalItem + Quantity;
                    }
                }
                document.write(totalPrice);
            }
        </script>
    </body>
</html>

【问题讨论】：

标签： javascript arrays error-handling while-loop do-loops

【解决方案1】：

您的do 循环未关闭，while 部分在那里丢失。应该是：

do {
  var productCode = prompt("enter product code:");
  var Quantity = prompt("enter quantity:");
  for (var i = 0; i<= productArray.length; i++) {
    if (productCode == productArray[i]) {
      totalPrice = totalPrice + unitpriceArray[i] * Quantity;
      totalVolume = totalVolume + shippingvolumeArray[i] + Quantity;
      totalItem = totalItem + Quantity;
    }
  }
  document.write(totalPrice);
} while (something);

【讨论】：

什么会取代（某物）？感谢您的快速回复。
我可以通过用 (i !=== 0) 替换 Something 来解决吗？