将数字等级更改为字母等级

change number grade to letter grade

本文关键字：数字更新时间：2024-04-19

我必须创建一个函数，该函数将接受一系列学生的姓名和成绩的用户输入。我单击添加按钮将数据添加到数组中。现在我想显示名称和等级，但将数字等级转换为字母等级。除了把号码改成字母外，我什么都能用。我的代码将向您显示，我使用了带有if-else语句的for循环，但它似乎没有获取数据。这是我的代码：

    html>
    <head>
        <meta charset=utf-8 />
        <title>Compute the average marks and grade</title>
        <link rel="stylesheet" type="text/css" href="Looping.css">
        <meta REQUIREMENT=
            "Using JavaScript, create a function that will accept user
            input for the name and grade for a series of students.  As
            input is given, store information (name and grade) in an
            array.  Click the 'Add' button after entering each student's
            data.    Click the 'Display' button to display the name and grade
            for each student and, then, the average for all grades.">

        <script>

            var userName, userAge;
            var nameData = [];
            var gradeData = [];

            function addToArray() {
                txtName = document.getElementById("txtName").value;
                txtGrade = parseInt(document.getElementById("txtGrade").value);
                alert(txtName + " " + txtGrade);
                nameData.push(txtName);
                gradeData.push(txtGrade);
                document.getElementById("txtName").focus();
                document.getElementById("txtName").value = "";
                document.getElementById("txtGrade").value = "";

            }
            function displayContent() {
                for (var i = 0; i < nameData.length; i++) {
                 //document.write("" + nameData[i] + " ," + gradeData[i] + "<br>");
                   if (gradeData >= 90) {
                        document.write( "" + nameData[i] + "A");
                    }
                    else if (gradeData >= 80) {
                        document.write("" + nameData[i] + "B");
                    }
                    else if (gradeData >= 70) {
                        document.write("" + nameData[i] + "C");
                    }
                    else if (gradeData >= 60) {
                        document.write("" + nameData[i] + "D");
                    }
                    else {
                        document.write("" + nameData[i] + "F");
                    }
                }
                }

        </script>
</head>
<body onload="showPrompt()">
    <h2>Compute Average Grades</h2>

    <div id="content">
    <p>Enter names and grades into a tow-dimensional array (and array of two arrays)
            using text boxes for input and two buttons; one to "Add" input to the arrays
            and one to calculate the average grade and "Display" the information in the arrays.
    </p>
    <p>
        <label for="txtName">Student Name:</label>
        <input type="text" id="txtName" value="">
            <br><br>
        <label for="txtGrade">Grade:</label>
        <input type="text" id="txtGrade" value="">
            <br><br clear: left>
    </p>
    <div style="text-align:center">
    <input type="button" class = "btnClass" value="Add" onclick="addToArray()">&nbsp;&nbsp;
    <input type="button" class = "btnClass" value="Display" onclick="displayContent()">
    </div>
</div>
</body>
</html>

您的displayContent函数应该是这样的：

      function displayContent() {
            for (var i = 0; i < nameData.length; i++) {
             //document.write("" + nameData[i] + " ," + gradeData[i] + "<br>");
               if (gradeData[i] >= 90) {
                    document.write( "" + nameData[i] + "A");
                }
                else if (gradeData[i]>= 80) {
                    document.write("" + nameData[i] + "B");
                }
                else if (gradeData[i]>= 70) {
                    document.write("" + nameData[i] + "C");
                }
                else if (gradeData[i]>= 60) {
                    document.write("" + nameData[i] + "D");
                }
                else {
                    document.write("" + nameData[i] + "F");
                }
            }
            }

在所有if语句中都缺少gradeData的索引引用。例如，第一个说：

if (gradeData >= 90) {

它应该说：

if (gradeData[i] >= 90) {