变量对象属性名称作为javascript中的参数？

Question

我有javascript对象如下：

var school = {
    grade1:[
    {
    "teacher":"anna",
    "student":"jacky"
    },
    {..},...
    ]
    grade2:[...]   
}

我尝试使用函数

检索内容时遇到了问题

function getNames(grade){
    $('#demo').text(school.grade[0].teacher); //returns an error
}

我可以使用school.grade1[0].teacher，但我想要一个grade变量。

当我尝试这个时，它显然不起作用：

var grade = 'grade1'; //I also tried just grade1 but it is an undefined varaible
getNames(grade); 

Answer 1

你可以做到

school[grade][0].teacher

Answer 2

您可以尝试这样：

function getNames(grade){
    $('#demo').text(grade.teacher);
}

var grade = school.grade1[0]
or
var grade = school.grade2[0]
getNames(grade);