Question

所以我之前发布了这个问题，但是我复制了错误的代码。这是您感兴趣的链接：Is it possible to quicksort objects based on their keys in an array, using JavaScript?

我有一个包含大量对象的数组。我要做的是根据特定属性（所有对象都拥有）重新排序数组。

所以这是我的代码：

   studentsArray = [];
    studentsArray = JSON.parse(localStorage.getItem("students"));
    console.log(studentsArray);


        function swap(qStudent, firstIndex, secondIndex){
            var temp = qStudent[firstIndex];
            qStudent[firstIndex] = qStudent[secondIndex];
            qStudent[secondIndex] = temp;
        }

        function partition(qStudent, left, right) {

            var pivot   = qStudent[Math.floor((right + left) / 2)],
                i       = left,
                j       = right;


            while (i <= j) {

                while (qStudent[i] < pivot) {
                    i++;
                }

                while (qStudent[j] > pivot) {
                    j--;
                }

                if (i <= j) {
                    swap(qStudent, i, j);
                    i++;
                    j--;
                }
            }

            return i;
        }

        function quickSort(qStudent, left, right) {

            var index;

            if (qStudent.length > 1) {

                left = typeof left != "number" ? 0 : left;
                right = typeof right != "number" ? qStudent.length - 1 : right;

                index = partition(qStudent, left, right);
                if (left < index - 1) {
                    quickSort(qStudent, left, index - 1);
                }

                if (index < right) {
                    quickSort(qStudent, index, right);
                }

            }

            return qStudent;
        }





    console.log(studentsArray.studentNumber); // <-- THIS RETURNS undefined IN CONSOLE

    var students;
    var updatedStudentArray;
    var qStudent;

    function sortStudentNumbers() {        
        var qStudent = studentsArray.studentNumber;
        quickSort(qStudent);
        var updatedStudentArray = JSON.stringify(studentsArray);
        localStorage.setItem("students", updatedStudentArray); 
        location.reload();
    }

在我的本地存储中，它看起来像这样：

Key: students
Value: [{"studentNumber":"123456","name":"Elisa Woman","presentNumber":0,"lateNumber":0,"absentNumber":0},{"studentNumber":"661211","name":"First Last","presentNumber":0,"lateNumber":0,"absentNumber":0},{"studentNumber":"941035","name":"Another Person","presentNumber":0,"lateNumber":0,"absentNumber":0}]

每当我尝试快速输入studentArrays.studentNumber时，Google Chrome（开发人员工具）会给我一个错误，指出无法读取未定义的长度。

当我使用内置排序功能时，它完美地运行，但不幸的是这是一个学校项目所以我必须打破快速排序功能。我的代码有什么问题吗？关于如何解决这个问题的任何建议？

提前致谢！

是否可以根据属性快速排序数组中的对象？使用Javascript

0 个答案: