警报弹出没有出现第二次

Question

我是新手javascript。所以，我只用头文件制作了简单的 html，并用这段代码将简单的 javascript 代码文件链接到它。警报弹出显示一次但不是第二次。

var pounds = prompt("Enter your weight in Pounds");

var kg = 0.456 * pounds;

Alert("Your weight is:" +"kg");

Answer 1

alert("Your weight is:"+ kg+"kg");

Answer 2

alert 不应大写

var pounds = prompt("Enter your weight in Pounds");

var kg = 0.456 * pounds;

alert(`Your weight is: ${kg}kg`);

Answer 3

您的问题只是一个错字。 In Javascript, all identifiers are case sensitive, so Alert() is not the same thing as alert(). (MDN link)

您在此处寻找 alert()：

var pounds = prompt("Enter your weight in Pounds");

var kg = 0.456 * pounds;

alert("Your weight is:" + "kg");

Alert pop up not showing up second time