javascript - 类型错误:无法读取 JavaScript 中未定义的属性 'push'

Question

我有一个名为 test 的数组，用于存储有关某个测试的信息。我正在开发评论功能，以便用户可以评论测试。目前用户只能发表一条评论，因为第二条评论会覆盖第一条评论。我现在想在每次输入评论时在数组“评论”中添加一个对象。

var test = [{
        id: 0,
        test_id: "Password test",
        pass: 1,
        fail: 5,
        time: 0.03,
        pass_fail: 20,
        comments : [
            {comment : "", commentuser : "" },
        ]
    }

我使用 push() 函数来做到这一点:

app.post('/test/:id/comment', urlencodedParser, function(req, res) {
    console.log("User Name : " + req.body.name);
    console.log("User Comment: " + req.body.comment);
    if (req.body.name && req.body.comment) {
        console.log('Your comment was posted !');
        res.sendFile(__dirname + '/HTML/comment-success.html');
        //test[req.params.id].comment = req.body.comment ;
        //test[req.params.id].commentuser = req.body.name ;
        var input = test[req.params.id].comments.comment;
        input.push(req.body.comment);

但是我收到以下错误: 类型错误:无法读取未定义的属性“推送”。 在此先感谢您的帮助。 干杯

Answer 1

请试试这个。

if (req.body.name && req.body.comment) {
  console.log('Your comment was posted !');
  res.sendFile(__dirname + '/HTML/comment-success.html');
  //test[req.params.id].comment = req.body.comment ;
  //test[req.params.id].commentuser = req.body.name ;
  test[req.params.id].comments.push({
    comment: req.body.comment,
    commentuser: req.body.name
  });
}