无法获得启动警报

Question

方向 在 index.html 和 script.js 文件中，添加以下内容：

Link your JavaScript file to your HTML file.
Create a function named numberCalculation
    Within the function, create two variables:
        The first variable should be named number1
            Set it to 45
        The second variable should be named number2
            Set it to 78
    Create another variable named multiplyNumbers and set it to number1 times number2
    Create an if statement that checks to see if multiplyNumbers is less than 2000
        If it is, add an alert that says "I wish it was a bigger number"
    If the variable multiplyNumbers is not less than 2000, alert "That's more like it!"
Below the definition of the above function, add a call to it: numberCalculation(). As a result, when the page is loaded, it should produce an alert with one of the above messages.

我知道它很明显我只是没有注意到它

script.js:

function numberCalculation(){
  var number1=45;
  var number2=78;
  var multiplyNumbers= number1*number2;  

  if (multiplyNumbers<2000);{
   alert("I wish it was a bigger number");

   if (multiplyNumbers>2000);
    alert("That's more like it!");
  } 
  numberCalculation();
} 

我应该得到“这更像是它！”警报，但我没有得到任何提示

Answer 1

您在定义中调用 numberCalculation() 函数。试试这个：

function numberCalculation(){
  var number1=45;
  var number2=78;
  var multiplyNumbers= number1*number2;  

  if (multiplyNumbers<2000) {
   alert("I wish it was a bigger number");
  }

  else if (multiplyNumbers>2000){
   alert("That's more like it!");
  } 
}

numberCalculation();

你在函数中的语法也有点不对。

Answer 2

由于if 行中的分号;，您编写的代码基本上如下

function numberCalculation(){
  var number1=45;
  var number2=78;
  var multiplyNumbers= number1*number2;  

  if (multiplyNumbers<2000);

  alert("I wish it was a bigger number");

  if (multiplyNumbers>2000);

  alert("That's more like it!");

  numberCalculation();
} 

等于

function numberCalculation(){
  var number1=45;
  var number2=78;
  var multiplyNumbers= number1*number2;  

  if (multiplyNumbers<2000) {

  }

  alert("I wish it was a bigger number");

  if (multiplyNumbers>2000) {

  }

  alert("That's more like it!");

  numberCalculation();
}

除此之外，numberCalculation() 需要从该函数外部调用，否则该函数将永远不会被调用。