我正在构建一个 Twitter 克隆。一段时间以来，我一直在摆弄如何让东西显示出来，但到目前为止，还没有成功。
我看到了
var $body = $('body');
$body.html('');
清除所有可能在脚本加载前写入的 html 标签(对吗？)
在 whats here 的情况下，当我尝试在脚本本身中添加 html 元素时，为什么它仍然不可见？例如，为什么标题不是来自
$upTop= $('<h1>Twittler</h1>').appendTo($body)
当我将它附加到正文时显示？我环顾四周，虽然也有类似的问题，但我没有找到明确/明确的答案来帮助我完成这项工作。我想一旦弄清楚“div”和 $body 在代码中的操作方式之间的关系，我就可以开始了。请参阅下面的代码源和评论。
我们已经感谢您的帮助。
<!DOCTYPE html>
<html>
<head>
<title>Twittler</title>
<script src="jquery.js"></script>
<script src="data_generator.js"></script>
<link rel ="stylesheet" href="Twittler.css">
</head>
<body>
<script>
$(document).ready(function() {
var $upTop = $('<h1>Twittler</h1>').appendTo($body);
var $body = $('body');
$body.html('');
var index = streams.home.length - 1;
while(index >= 0) {
var tweet = streams.home[index];
var $tweet = $('<div></div>');
$tweet.text('@' + tweet.user + ': ' + tweet.message);
$tweet.prependTo($body);
index -= 1;
}
});
</script>
</body>
</html>
<!--
Comments:
That file is called `data_generator.js`. You don't need to understand the code that's in it, but here's what it does:
* Creates two global variables, `users` and `streams`.
* `users` is an array of strings: all the usernames that you're following.
* `streams` is an object with two properties, `users` and `home`.
* `streams.home` is an array of all tweets from all the users you're following.
* `streams.users` is an object with properties for each user. `streams.users.albreyb` has all of `albreyb`'s tweets.
* Kicks off a periodic process that puts more data in `streams`.
You'll mostly be working in the javascript block of `index.html`. Note: The generated tweets will be displayed in reverse chronological order.
Basic Requirements:
- [ ] Show the user new tweets somehow. (You can show them automatically as they're created, or create a button that displays new tweets.)
- [ ] Display the timestamps of when the tweets were created.
- [ ] Design your interface so that you want to look at and use the product you're making.
- [ ] Allow the user to click on a username to see that user's timeline.
We want to be able to have the new tweets show up (at the top of the page) when we click a button.
We want the old tweets to be maintained (in a different container/div?)
We want to be able to click the button again and shift those tweets down in to the container/div.. and so on.
-->
最佳答案
我对你的问题到底是什么感到有点困惑，但正如你所说
var $body = $('body');
$body.html('');`
清除 body 和
var $upTop = $('<h1>Twittler</h1>').appendTo($body);
添加到正文中，但这些东西以相反的顺序运行。首先，您要添加到主体，然后清除它，所以最后它是空的。
关于javascript - 重建 twitter 克隆中的 JQuery/HTML 关系，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34912573/