Question

我编写了简单的重量转换代码，并编写了一个年度利润计算器程序，要求用户输入。当我在vscode中运行程序时，它显示错误“ ReferenceError：提示未定义。”

var weight_in_lbs = prompt("Please enter the weight in lbs you wish to convert:");
var pound_to_kg = (weight_in_lbs * .45359237);
console.log("The weight converted in kg is" + " " + pound_to_kg.toFixed(3))`

var annualSales = prompt("What is the projected total sales amount?");
var salesPrediction = (annualSales * .23);
console.log ("Your annual profit is " + salesPrediction.toFixed(2)) ;

Answer 1

prompt在Node.js运行时中不是有效的构造（假定这是您通过VSCode运行的构造）。它将仅在基于浏览器的JavaScript引擎中工作。

有些库提供了类似的功能，但是您必须通过NPM安装并将其导入到脚本中。

Answer 2

在使用Electron环境的VS Code中，prompt函数不受支持，因为它是UI阻塞的。有关更多信息，请参见此issue。

您将需要在浏览器（例如下面的代码段）中运行示例。

var weight_in_lbs = prompt("Please enter the weight in lbs you wish to convert:");
var pound_to_kg = (weight_in_lbs * .45359237);
console.log("The weight converted in kg is" + " " + pound_to_kg.toFixed(3))
var annualSales = prompt("What is the projected total sales amount?");
var salesPrediction = (annualSales * .23);
console.log("Your annual profit is " + salesPrediction.toFixed(2));

如何修复JavaScript参考错误：提示未定义

2 个答案: