如何对 JavaScript 中的二维数组进行排序？

Question

My sorting function at the end isn't working.我最后的排序 function 不起作用。 I want to sort student grades in ascending order but I can't get it to print out.我想按升序对学生成绩进行排序，但无法打印出来。 My sorting function goes through and manually compares however I can't get it to work.我的排序 function 经历并手动比较，但我无法让它工作。 The problem may be that the student class is whats being used to add values to the array.问题可能是学生 class 用于向数组添加值。

<html>
<body>
<script>
    class Student {
        constructor(name,grade) {
            this.name = name;
            this.grade = grade;
        }
         detail() {
            document.writeln(this.name + " " + this.grade + "<br/>")
         }
    }
    var grade = [];
    var count = 0;

    function setStudent() {
        var name = prompt("Enter Name", "name");
        while(name != '???') {
                var grades= parseInt(prompt("Enter Grade", "Grade"));
                var student = new Student(name,grades);
                grade.push(student);
                name = prompt("Enter Name", "name");
                count++
                }
        }

    function showGrades() {
        for(i=0;i<count;i++) {
            grade[i].detail();
        }
    }
    function maxGrade() {
        var mgrade = grade[0].grade;
        var names = "";
        for (i=0;i<count;i++) {
            if(mgrade<grade[i].grade) {
                mgrade=grade[i].grade;
                names = grade[i].name
            }
        }
        document.writeln("Max Grade: " + mgrade + " Name: " + names);
    }

    setStudent();
    showGrades();
    maxGrade(); 
    document.writeln("<br/> Assorted List (Ascending): <br/>"); 

    grade.sort(function(a,b) {
        return a[0] - b[0] || a[1] - b[1];
    });
    console.log(grade);



</script>
</body>
</html>

Answer 1

The problem is this statement:问题是这样的声明：

 grade.sort(function(a,b) {
        return a[0] - b[0] || a[1] - b[1];
    });

a and b are Student objects. a和b是学生对象。 It shows that right in your console.log statement.它在您的console.log语句中显示了这一点。 So, a[0] and b[0] are undefined.所以， a[0]和b[0]是未定义的。

I am not sure what a[1] - b[1] refers to, but I think you want this:我不确定a[1] - b[1]指的是什么，但我认为你想要这个：

grade.sort(function(a,b) {
        return a.grade - b.grade;
    });

如何对 JavaScript 中的二维数组进行排序？

问题描述

1 个解决方案

解决方案1
0 2019-09-26 19:14:37

如何对 JavaScript 中的二维数组进行排序？

问题描述

1 个解决方案

解决方案1 0 2019-09-26 19:14:37

解决方案1
0 2019-09-26 19:14:37