Question

我的代码如下。我的目标是编写一个javascript代码，提示用户输入1表示加法，2表示减法，或0表示退出。当您输入1或2进行加法或减法时，它应该写入屏幕＆＃34;您已选择加法（或减法）＆＃34;，然后提示您输入第一个数字，然后输入第二个数字，然后显示结果＆＃34; （num1）添加到（num2），结果是（sum）＆＃34;，所有都在蓝色标题下，带有一个黄花背景（我发现的部分）。我是一个新手javascript。发生的事情是，当我输入最后一个号码时，它正在将所有内容一次性写入屏幕。如何在输入时将每个部分写入屏幕？

＆＃13;

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Jeremy's Assignment 4 Solution</title>

        <div style = "background-color:lightgoldenrodyellow; color: blue; text-align: center;">
            <script type = "text/javascript">
                <!--

                var now = new Date(); //current date and time
                var hour = now.getHours(); // current hour (0-23)

                // determine whether it's morning
                if (hour < 12 )
                    document.write( "<h2>Good Morning, " );

                 // determine whether the time is PM
                 if ( hour >= 12 )
                 {
                    // convert to a 12-hour clock
                    hour = (hour - 12);

                    //determine whether it is before 6 PM
                    if ( hour < 6 )
                        document.write( "<h2>Good Afternoon, " );

                    // determine whether it is after 6 PM
                    if ( hour >= 6 )
                    document.write( "<h2>Good Evening, " );
                 } // end if

                 document.writeln( " Welcome to Jeremy's Assignment 4 Solution.</h2>" );
                 // -->
            </script>
        </div>
        <div style = "text-align:center">
            <script type = "text/javascript">

                var choice = choice = window.prompt("Enter 1 for Addition, 2 for Subtraction, or 0 to Quit", "0");

                while (choice != 0) {


                    if (choice == 1) {
                        document.write("<p style='text-align:center;'>You have selected to perform Addition</p>");

                        // read in first number from user as a string
                        num1 = window.prompt("Enter first integer");

                        // read in second number from user as a string
                        num2 = window.prompt("Enter second integer");

                        //convert numbers from strings to integers
                        number1 = parseInt(num1);
                        number2 = parseInt(num2);

                        sum = number1 + number2; // add the numbers

                        //display the results
                        document.writeln("<p style='text-align:center;'> " + num1 + " added to " + num2 + " the result is " + sum + "</p>");
                    }
                    else if (choice == 2)
                    {
                        document.write("<p style='text-align:center;'>You have selected to perform Subtraction</p>");

                        // read in first number from user as a string
                        num1 = window.prompt("Enter first integer");

                        // read in second number from user as a string
                        num2 = window.prompt("Enter second integer");

                        //convert numbers from strings to integers
                        number1 = parseInt(num1);
                        number2 = parseInt(num2);

                        sum = number1 - number2; // add the numbers

                        //display the results
                        document.writeln("<p style='text-align:center;'> " + num1 + " subtracted from " + num2 + " the result is " + sum + "</p>");
                    }
                    else
                        (choice == 0)
                    {
                        document.write("<p style='text-align:center;'>You have selected to exit</p>");
                        break;
                    }
                }


            </script>
        </div>



    </head>
    <body>
        <!-- Button to go to home page -->
        <p style="text-align: center">
         <button style="height:25px;width:100px" onclick="window.location='index.html'">HOME</button>
        </p>
    </body>
</html>

＆＃13;

每次输入提示输入时，如何让javascript写入屏幕？

0 个答案: