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java - The websocket server's onMessage() method reports a null pointer exception as soon as it operates the database.

I want to use websocket to implement the new message reminder function. For example, a posts an article and so...

From [HTMLdiscussion group] 2017-06-17 09:16:37 0  2  1263

javascript - When the mouse is clicked on the Canvas page, how to determine whether the position of the point is on the line drawn in it? Something triggers an event on a drawn line?

Below are three sections of underlined code. When I enter the editing mode; when I click the left mouse button...

From [HTMLdiscussion group] 2017-06-13 09:24:19 0  1  1263

Curl bottom edge of div inwards using CSS

I want to bend the bottom edge of this rectangular div/background using CSS, so the result is this: Does anyon...

From [HTMLdiscussion group] 2023-10-23 19:55:32 0  2  1261

html5 - 可以讓z-index不管多小，子元素總是顯示在父元素之上嗎

就是 子元素 的 z-index 小于父元素時(shí)，仍然顯示在 父元素 上面

From [HTMLdiscussion group] 2017-04-17 14:46:24 0  5  1261

css - FireFox border樣式異常

在FireFox下,頁面里一些table的邊框顯示異常(消失不顯示),但在IE和Chrome下正常;頁面效果： 單元格樣式： 頁面在縮放時(shí)，邊框消失的情況會(huì)發(fā)生改變。求大神幫忙回答，謝謝！ calendar.css如下：...

From [HTMLdiscussion group] 2017-04-17 14:49:44 0  2  1260

html5 - h5頁面上如何播放優(yōu)酷視頻

移動(dòng)端video標(biāo)簽播放視頻，如何在video標(biāo)簽中引用優(yōu)酷視頻的地址，做到可以在手機(jī)網(wǎng)頁上播放，就像在優(yōu)酷客戶端上播放一樣

From [HTMLdiscussion group] 2017-04-17 12:08:44 0  4  1260

value="" 這個(gè)是什么意思？還有為什么name后面又加了id比如上面的name="pass" id="pass"？

From [HTMLdiscussion group] 2016-12-20 14:51:49 0  1  1258

Alibaba Cloud virtual machine tp5

In the page, the css and js are filtered out by the filter and cannot be displayed. Please tell me how to deal...

From [HTMLdiscussion group] 2019-01-19 10:24:55 0  2  1258

html5 - html css js等web前端技術(shù)可以用來寫windows下客戶端程序？

http://www.wandoujia.com/join#job-1 在這個(gè)豌豆莢招聘前端工程師的頁面中，說豌豆莢win版本是基于webkit開發(fā)的客戶端軟件，職位要求里說用web前端技術(shù)開發(fā)windows客戶端，我是...

From [HTMLdiscussion group] 2017-04-17 13:04:16 0  13  1258

Global installation and local installation

After glup is installed globally, why do I still need to install glup locally when developing projects? How to...

From [HTMLdiscussion group] 2019-03-28 10:45:59 0  0  1257

這個(gè)家提示文字是怎么實(shí)現(xiàn)的？還沒怎么明白？

From [HTMLdiscussion group] 2016-12-24 15:12:57 0  2  1257

Where can I download the text, pictures and other files of this courseware?

Xiaomi Mall static web page

From [HTMLdiscussion group] 2018-12-02 16:27:04 0  0  1256

<tr valign="top"> Can't understand

<tr valign="top"> What does this mean? valign means vertical alignment. Then what does this = ...

From [HTMLdiscussion group] 2020-04-09 19:54:35 0  1  1255

angular2組件傳值

上面是我的頁面的入口代碼，top是頂部logo顯示部分，slider是我的左側(cè)菜單，main中是我具體的頁面。我的頁面是管理系統(tǒng)類型的，所以當(dāng)為login路徑時(shí)，我希望左側(cè)的slider是不顯示的（isLogon為fal...

From [HTMLdiscussion group] 2016-11-17 15:37:34 0  2  1255

absolute之整體布局實(shí)現(xiàn)

要實(shí)現(xiàn)如圖的布局，我最先想到是將header與footer絕對定位，但是發(fā)現(xiàn)在移動(dòng)端會(huì)出現(xiàn)bug，經(jīng)查資料發(fā)現(xiàn)用absolute實(shí)現(xiàn)整體布局非常好，還挺簡單的。.header, .footer, .c...

From [HTMLdiscussion group] 2016-10-24 10:23:14 0  0  1253