使用 Javascript 对话框 + 显示结果获取和、积、差和商

Question

我正在尝试开发一个 Javascript 程序，它会提示用户输入两个整数，然后显示这两个整数的和、乘积、差和商。现在它只显示总和。我实际上不知道乘法、减法和除法命令是否正在执行。这是 jsfiddle 的 link：http://jsfiddle.net/xsdztwoc/

代码：

<!DOCTYPE html>
<html>
<head>
  <meta charset = "utf-8">
  <title>Integer Application</title>
  <script>

     var firstNumber; // first string entered by user
     var secondNumber; // second string entered by user
     var number1; // first number to add
     var number2; // second number to add
     var sum; // sum of number1 and number2
     var product; //product of number1 and number2
     var difference; //difference of number1 and number2
     var quotient; //quotient of number1 and number2

     // read in first number from user as a string
     firstNumber = window.prompt( "Enter first integer" );

     // read in second number from user as a string
     secondNumber = window.prompt( "Enter second integer" );

     // convert numbers from strings to integers
     number1 = parseInt( firstNumber ); 
     number2 = parseInt( secondNumber );

     sum = number1 + number2; // add the numbers
     product = number1 * number2; //multiply the integers
     difference = number1 - number2; //subtract the integers
     quotient = number1 / number2; //divide the integers

     // display the results
     document.writeln( "<h1>The sum is " + sum + "</h1>" );
     document.writeIn( "<h1>The product is " + product + "</h1>");
     document.writeIn
     ( "<h1>The difference is " + difference + "</h1>");
     document.writeIn( "<h1>The quotient is " + quotient + "</h1>");
    </script>
    </head><body></body>
</html>

感谢您提供的任何帮助！

Answer 1

jsFiddle

问题似乎只是因为您正在使用 document.writeIn 但这不是一个函数。您要使用： document.writeln 代表 writeLine

JS

// display the results
document.writeln( "<h1>The sum is " + sum + "</h1>" );
document.writeln( "<h1>The product is " + product + "</h1>");
document.writeln( "<h1>The difference is " + difference + "</h1>");
document.writeln( "<h1>The quotient is " + quotient + "</h1>");

使用 Javascript 对话框 + 显示结果获取和、积、差和商

Obtain Sum, Product, Difference, and Quotient using Javascript Dialog Boxes + Display Results

javascript

integer

dialog

sum

multiplication

jsFiddle