javascript - websocket 用于nodejs统计在线人数

我想用websocket来统计在线人数。登陆成功，转到home.html.在home显示在线人数，但是，不停报错，我接触nodejs不多，选修作业实在有点应付不来，希望得到指导，谢谢 html代码如下： {代码...} ...

From [JavaScriptdiscussion group] 2017-04-11 13:07:13 0  1  1500

status=yes 是什么意思？

status=yes   是什么意思？

From [JavaScriptdiscussion group] 2016-12-24 09:18:57 0  2  1498

What does the new operator do?

Can you briefly introduce the function of new operator?

From [JavaScriptdiscussion group] 2020-02-02 20:48:23 0  1  1496

javascript - hover一个元素时，能否改变父元素的状态

{代码...} 鼠标悬停在img标签上是修改div的背景颜色用hover怎么写不能使用js，只能用css来写，是否能够实现？

From [JavaScriptdiscussion group] 2017-04-10 16:24:05 0  12  1496

How to create a variable with a fixed data type that can be input by yourself

var a=prompt() What if the value we need to input must be a number?

From [JavaScriptdiscussion group] 2021-08-05 12:26:18 0  1  1495

javascript - Implementation principle of browser zoom size

RT, due to personal usage habits, when using Chrome, the default zoom ratio is adjusted to 90%. When testing s...

From [JavaScriptdiscussion group] 2017-07-05 10:58:28 0  3  1495

javascript - How to get all attribute names of an img tag node using js?

{Code...} Assume that there are many img tags with a structure similar to the above, but the number of attribu...

From [JavaScriptdiscussion group] 2017-06-12 09:31:49 0  4  1495

When the delete keyword deletes an element, what type is its value by default? Can the default be 0?

<script> // Use the [] method to create an array var arr = ["Zhang San", "Male", 25,...

From [JavaScriptdiscussion group] 2018-08-03 12:05:08 0  1  1494

javascript - setInterval里面this指向的是window，下面的函数怎么理解

{代码...} 按照理解window里没有show的方法，结果打印出来的是a对象，理解不了，求大神指点

From [JavaScriptdiscussion group] 2017-04-10 17:22:18 0  11  1494

Isn't getday() returning 0-6?

Isn't getday() returning 0-6?

From [JavaScriptdiscussion group] 2019-03-26 12:16:00 0  2  1493

Isn't it okay that time is not defined? Why are we different?

From [JavaScriptdiscussion group] 2018-05-24 19:37:53 0  1  1493

Javascript的typeof为什么会返回function

这是 W3C的描述：对变量或值调用 typeof 运算符将返回下列值之一 undefined - 如果变量是 Undefined 类型的 boolean - 如果变量是 Boolean 类型的 number - 如果变量...

From [JavaScriptdiscussion group] 2017-04-11 11:33:00 0  2  1493

javascript - Debugging code with vs code, 'window is not defined' appears

Is this due to a problem with node running locally or some other reason? I looked at some similar questions an...

From [JavaScriptdiscussion group] 2017-06-12 09:29:15 0  2  1489

javascript - 小程序wx.previewImage预览图片出现黑屏是什么原因？

一个类似相册的图片列表，点击相应的图片会出大图预览，类似于朋友圈看图片的功能。现在的问题是点击小图后就黑屏，尝试过用网络图片，也无法解决。在真机赏预览也无法正常显示。代码如下： 现在的效果： 点击小...

From [JavaScriptdiscussion group] 2017-04-11 12:09:31 0  3  1488

javascript - Delete pop-up window made by VUE. After clicking Cancel, clicking the button related to the module still pops up the delete box.

I use vue2.0 to make comments and other functions. When I clicked the delete button and the prompt box popped ...

From [JavaScriptdiscussion group] 2017-05-19 10:47:03 0  2  1483