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489 views

1 answer

react 合成事件对象中的target与currentTarget为什么都要指向触发的元素

在nativeEvent中target指向的是触发的dom元素，currentTarget指向的是document，在syntheticEvent 获取到的target currentTarget都是指向当前触发与绑定的元素那么react 为什么要把currentTarget在syntheticEvent中修改为当前绑定的元素呢？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

275 views

1 answer

python - showing pytest diff inside pytest.fail call

When pytest's assert fail, it shows a really nice diff between expected and actual data. E AssertionError: assert {'0' ... pytest at that moment. How to show pytest-style diff?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

760 views

1 answer

js如何处理树形数据如何从最末级向上递归，计算每个节点的children中的某个字段的值的合计

需求是一个树表，每个节点都有field1 field2 field3 id pid这几个字段，field3由field1xfield2得到，父节点的field3由每个子节点的field3相加得到，如果我修改其中某个子节点的field1 或 field2 ，就从 ... - 4 2-2-1 2 2 4 数据格式为普通树，子节点在节点的children字段中...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

401 views

1 answer

SplitChunksPlugin的疑问

webpack配置SplitChunksPlugin打包可是为什么没有看到第三方文件还是只有main.js一个文件...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

475 views

1 answer

ES 中用 term 查询不到数据是什么原因？

我mapping有个kid，type是keyword，我用{ "term" : { "kid" : "KB1" }}} 去查询只能查到一条记录，{ "match" : { "kid" : "KB1" }}} 去查询有两条 KB1就是有两条记录的记录 ... 它都是一样的不是说term是精准匹配吗？为什么会这样，我遗漏了什么知识点吗？ ES 版本 5.X...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

420 views

1 answer

page refresh - Update rate of embedded google spreadsheet

I have a google sheet and have successfully added the embedded link into my website. I've edited the HTML and link ... once every 5 minutes. But apparently that's not true....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

374 views

1 answer

vuejs和flask的上传文件的交互问题

各位大侠，我使用vuejs的el-upload传文件，用flask的接收文件 el-upload组件使用的是多个文件，手动上传我之前写的单个文件上传接收f = request.files['file']是成功的，我又写了一个多个文件上传，用接 ... 后在用for f in fs：来遍历，但反复测试不成功问题出在哪里呢？我怎么才能同时接收多个文件呢？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

461 views

1 answer

vue反向代理配置

现有vue上线项目需要另外做一个测试版本，有本地调试需求需要'/api'下走代理，其余走本地， vue.config.js中应该怎么配置呢？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

391 views

1 answer

express输出视频采用了fs.createReadStream可是却不能使用进度条进行视频节点选择

想要通过express输出本地视频，再前端使用video标签进行播放，可是输出的视频无法进行进度条操作，请问还有什么办法能够解决？或者还有什么办法能够输出视频？ app.get('/video/:id', ... rs.on('end', function () { res.end(); console.log('end call'); }); });...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

558 views

1 answer

通过HTML的META设置expires和cache-control 控制缓存真的能生效吗？

网上有很多帖子教通过HTML的META设置expires和cache-control设置缓存 <meta http-equiv="Cache-Control" content="max-age=7200" /> <meta http-equiv="Expires" content= ... 是，验证后并没有效果这个方案真的有效吗？或者具体哪些场景下有效？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

931 views

1 answer

js 数组转换问题

` let arr1= [ {role:["O","O","O","B-V","O","O","O","O","O","O","O","O","O"], text:["Two","of","them","were"," ... },{'role':'I-ARG0','text':'Ministry'}, {'role':'O','text':'.'} ] ]...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

440 views

1 answer

整合SSM跳转界面出现404错误

问题描述跟着B站视频做的几乎一模一样的项目，出现了org.springframework.web.servlet.DispatcherServlet.noHandlerFound No mapping for GET /book/allBook 异常，导致无法打开页面 ... 果是什么？只是想单纯的用SSM做个CRUD，希望大佬们可以帮忙看看，感谢！...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

660 views

1 answer

步骤条里边从后台获取的数据,怎么改变其中电话的颜色

这是我的步骤条组件的代码,比较简易这是要实现的效果这是数据格式请问怎么实现,目前没有头绪...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

350 views

1 answer

怎么让vue-cli支持顶层await

如题背景是需要在一个入口文件动态引进其他插件，然后再将这些插件暴露出去，顶层await这个语法目前在chrome可以正常使用，但是在vue-cli中会报编译错误 ... const modules = await Promise.all(libPathHandlers) // todo.... export modules // compile error...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

721 views

1 answer

echart折线图图例中的圆圈左右两边有两个尾巴，如何去除掉？

问题描述 echart折线图图例中的圆圈左右两边有两个尾巴，如何去除掉？ echart截图期望效果...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

470 views

1 answer

integer - Java 3.6 Checking inputs

Ask the user to "Input a number: " 4 times. If the input is not a number, ask again. Output "success." after they ... "success."); } This is very basic stuff but I am struggling....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

302 views

1 answer

json里面能使用变量吗？

` // 例如json数据 json:{ data1:'xxxx', data2:'data1 + "yyy"' } ` 想表达的意思就是能能不能在json中使用内部变量？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

288 views

1 answer

php - ICS file showing dangerous script

I am trying to generate the .ics file through PHP. But after download, the file google chrome showing the dangerous file. ... attachment; filename='.time().'.ics'); echo $ical;...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

178 views

1 answer

python列表去重

原始列表: [[2,2,3],[2,3,2],[3,2,2],[7]] 去重后的列表: [[2,2,3],[7]] 列表里的元素不分顺序,只是把重复的列表去掉,只保留一个该如何做啊...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.4k views

1 answer

nodejs 官网怎么了？

是发生了什么，有什么运动么？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

387 views

1 answer

Using symbols / special characters giving me error

I am using prettier extension, but I am getting "unexpected error" error when using special characters like (&#38) ... anyone knows how to solve this error. Regards, Shehzad Asif...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

550 views

1 answer

antlr4 - ANTLR pattern for second pass errors

Once there is a parse tree, a visitor or listener walk of the parse tree to do the actual translation will encounter errors ... choice and I just don't quite grasp how I do that....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

373 views

1 answer

Normalization/Database Design with nested repeating groups

I am trying to design a database and I'm struggling a little. I'd really appreciate if anyone could have a look. ... 's underlined, and foreign keys with an @ sign beside them....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

555 views

1 answer

关于vue-cli3和postcss-px2rem-exclude打包后字体不生效

"lib-flexible": "^0.3.2", "postcss-px2rem-exclude": "^0.0.6" 使用vue-cli3最新版v4.4.4，配置了postcss.config.js,开发模式下px2rem能生效，/px/能根据dpr设置px，但是打包过后/px/没生效，直接被编译成rem，网上没找到答案，希望有大佬指点，谢谢...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

580 views

1 answer

打造个人支付接口，js 如何做到监听手机app的支付信息？

原理如下： js实现，用什么工具的技术，请朋友们帮忙分析下。...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

818 views

1 answer

Incompatibile SockJS! Main site uses:.... sockjs报错？

先上图： sockjs stomp springboot-websocket 公司的项目，经测试，直连没有问题，但只要放到服务器上，除了第一次连接，用户只要刷新页面，触发重连就开始报错 nginx的socket已经配置过了，在前 ... default new Socket(baseURL) 服务器环境弄这个东西弄了一周了，请教一个解决办法，谢谢??...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

146 views

1 answer

java - Display contents of an array in a listview

Im making a project where the list items are contents with multiple attributes (username and passoword). I want to make the listview only ... .add(new user("Jack", "Hell1")); } } }...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

272 views

1 answer

Java虚拟机-三色标记的疑问

看《深入理解Java虚拟机》中的并发的可达性分析-三色标记提到黑色对象被误标记为白色需要同时满足两个条件：赋值器插入了一条或多条从黑色对象到白色对象的新引用赋值器删除了全部从灰色对象到该白色对象的直接或间接引用这里有点疑问， ... 第二点，也能出现黑色对象（假设新创建的对象不应该被回收）被误标记为白色的情况了有没有大佬解释一下，很困惑现在 ...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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