javascript:警报在任何浏览器中都不起作用，为什么

Question

我有简单的 JavaScript 代码，但警报在任何浏览器中都不起作用 我的代码是:

 function ChangeText(){
    document.getElementById("p1").innerHTML = "dorood";
    }
    var students = [student1, student2, student3];
    var student1 ={FirstName:"saeed",LastNmae:"alavi",Age:"1992"};
    var student2 = { FirstName: "mohammad", LastNmae: "alavi", Age: "1992" };
    var student3 = { FirstName: "hosein", LastNmae: "alavi", Age: "1992" };
    alert(students[1].FirstName);

Answer 1

你只需要移动 var Students = [student1,student2,student3];您所指的变量未分配。

    var student1 ={FirstName:"saeed",LastNmae:"alavi",Age:"1992"};
    var student2 = { FirstName: "mohammad", LastNmae: "alavi", Age: "1992" };
    var student3 = { FirstName: "hosein", LastNmae: "alavi", Age: "1992" };
    var students = [student1, student2, student3];
    
    alert(students[1].FirstName);