Question

我试图通过循环遍历对象数组来创建一个带有jQuery的简单表，但是在控制台中获取此消息：

TypeError: 'undefined' is not an object (evaluating 'people[i].lastName')

如果我定义特定对象（即John.lastName）但不使用array[i]，它是否有效，我做错了什么？

var person = function(firstName, lastName) {
    this.firstName = firstName || "Anonymous";
    this.lastName = lastName || "Anonymous";
    };

    var John = new person("John", "Walter");
    var Bob = new person("Bob", "Stevens");
    var Gerry = new person("Gerry", "Cricket");
    var Frank = new person("Frank", "Bloom");

    var people = [John, Bob, Gerry, Frank];

    for (i = 0; i < people.length; i++) {

    $(document).ready(function() {
    $("body").append("<table><tr><td>" + people[i].lastName + "</td></tr></table>");
    });

    };

Answer 1

You can't put a $(document).ready within a for loop. Put your function inside the document.ready and your code works fine. To Add a table before the for loop and the /table 
after the for loop to prevent making each row in the array a table.

     $(document).ready(function()
  {
var person = function(firstName, lastName) {
    this.firstName = firstName || "Anonymous";
    this.lastName = lastName || "Anonymous";
    };

    var John = new person("John", "Walter");
    var Bob = new person("Bob", "Stevens");
    var Gerry = new person("Gerry", "Cricket");
    var Frank = new person("Frank", "Bloom");

    var people = [John, Bob, Gerry, Frank];
        $("body").append("<table>");

    for (i = 0; i < people.length; i++) {
console.log(people[i]);

   $("table").append("<tr><td>" + people[i].lastName + "</td></tr>");

    };
    $("<table>").append("</table>");
    });

尝试使用jQuery从对象数组创建简单表

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