javascript - 当我想打印成绩时我的 java 脚本出错

Question

当我只打印出学生姓名和他们的分数时，我没有遇到任何问题，但是当我编写用于计算或返回他们的成绩的代码时，它没有显示我想要的成绩。当我想输入时学生 1 的学生姓名和分数，它只是跳过学生 2 并询问学生 3 的姓名和年级...有人知道如何解决吗？下面是我的代码:

function Average() {
  var text = "";
  var person = new Array();
  var marks = new Array();
  var grade = new Array();
  for (var i = 0; i < 3; i++) {
    person[i] = window.prompt("enter student name " + (i + 1) + "of 3", "");
    marks[i] = window.prompt("enter student marks " + (i + 1) + "of 3", "");

    for (var i = 0; i < marks.length; i++) {
      if (marks[i] >= 85 && marks[i] < 100) {
        grade[i] = "HD";
      } else if (marks[i] >= 75 && marks[i] < 85) {
        grade[i] = "D";
      } else if (marks[i] >= 65 && marks[i] < 75) {
        grade[i] = "C";
      } else if (marks[i] >= 50 && marks[i] < 35) {
        grade[i] = "P";
      } else if (marks[i] >= 00 && marks[i] < 50) {
        grade[i] = "F";
      }

      text += "the student name  is : " + person[i] + "&nbsp" + "&nbsp" + "theirs marks are : " + marks[i] + grade[i] + "<br>";
    }
    // text += "the student name  is : " + person[i] +"&nbsp"  +"&nbsp" + "theirs marks are : "  + marks[i] +  grade[i] +"<br>";
  }
  document.getElementById("id").innerHTML = text;
}

<p> click this to active the window prompt </p>
<button onclick="Average()"> Click Me </button>
<p id="id"></p>

我的结果:

Answer 1

在开始循环计算之前，您还没有结束循环提示。它应该是:

function Average() {
  var text = "";
  var person = new Array();
  var marks = new Array();
  var grade = new Array();
  for (var i = 0; i < 3; i++) {
    person[i] = window.prompt("enter student name " + (i + 1) + "of 3", "");
    marks[i] = window.prompt("enter student marks " + (i + 1) + "of 3", "");
  }
  for (var i = 0; i < marks.length; i++) {
    if (marks[i] >= 85 && marks[i] < 100) {
      grade[i] = "HD";
    } else if (marks[i] >= 75 && marks[i] < 85) {
      grade[i] = "D";
    } else if (marks[i] >= 65 && marks[i] < 75) {
      grade[i] = "C";
    } else if (marks[i] >= 50 && marks[i] < 35) {
      grade[i] = "P";
    } else if (marks[i] >= 00 && marks[i] < 50) {
      grade[i] = "F";
    }

    text += "the student name  is : " + person[i] + "&nbsp" + "&nbsp" + "theirs marks are : " + marks[i] + grade[i] + "<br>";
  }
  document.getElementById("id").innerHTML = text;
}

<p> click this to active the window prompt </p>
<button onclick="Average()"> Click Me </button>
<p id="id"></p>

此外，您的评分系统不计算 100(只有 <100)，我认为您输入的是“35”而不是“65”:

if (marks[i] >= 85 && marks[i] <= 100) {
...
} else if (marks[i] >= 50 && marks[i] < 65) {

希望这对您有所帮助!