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描述现在共有三个组件：A、B、C。 C是B子组件，B是A子组件。现在C、B本身都有插槽，想在A组件中调用B时，直接使用C声明的插槽，如何实现呢？代码写了一段期望符合预期的代码。然而vue提示异常，求大佬指点 https://codesandbox.io/s/dawn......

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

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622 views

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c# - How to stop ASP.NET web application from keeping SQL connection open when all connections are closed after use?

I've been fighting with this problem for a significant period of time now but can't seem to find any way to permanently fix it. In our internal CRM system (ASP. ... data = new DataSet(); da.Fill(data); sqlconnection.Close(); return data; }...

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

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664 views

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python - Error when using treetagger : list index out of range

I am using treetagger to extract lemma of word. I have a function which do that but for some words it is giving list out range error : def treetagger_process( ... mot 22 print(lemme) IndexError: list index out of range Example of texte :...

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

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723 views

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egg框架如何处理bodyParser的错误？

一旦请求体太大会报错： 2020-11-05 10:30:25,638 WARN 15522 [-/::1/-/5ms POST /file/upload?_csrf=65aNrQrDPCJFtxoR8PeLvdN9] nodejs.PayloadTooLargeError: request entity too large, check bodyParser config ... || 500; } }; }; 依然不行如何才能捕获bodyParer的错误并返回给前端？...

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

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465 views

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supervisor 通过虚拟环境中的gunicorn运行程序提示找不到模块

非 root 用户，网站目录是 /home/www/web/ supervisor 配置文件： [program: weba] dirctory = /home/www/web/ command = /home/www/web/.env/bin/gunicorn -w 4 'app:create_app()' autostart ... 入：/home/www/web/.env/bin/gunicorn -w 4 'app:create_app()' 是OK的这是什么情况...

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

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458 views

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echarts中涟漪颜色动态设置

项目通过websocket连接不管设备是否在线，都是推给我全部的设备，仅仅是type:online/offline表示设备状态设备为在线时，如下图所示设备为离线时，如下图所示采用的是:echart+百度地图部分代码: ` series: [ { type: "effectScatter", ... } }, zlevel: 1 } ] ` 目的:当某个设备离线时，就将对应点的颜色变为红色，应该怎么设置rippleEffect里面的color？...

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

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503 views

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帮我理解这个正则表达式，实在搞不懂

下面是千分位格式化的正则表达式，传入1234567890，返回 1,234,567,890 不知道如何理解，请逐个字符解释给我这个小白听 function regFormatPermil(v){ const reg = /d{1,3}(?=(d{3})+$)/g return `${v}`.replace(reg,'$&,') }...

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

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1.1k views

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jq 修改input（checkbox）值

比如 var flmArr=[1,3,4,6]; 有好多个checkbox ，如果checkbox的value值是flmArr其中一个值那么这个checkbox设置为选中状态，否则设置未选中 <label> <input type="checkbox" name="checkGy" value="1" />分类1 </label> <label> ... 值想与所有的input的value值对比如果有相同值的选中没有的设置未选中上面我写的代码有问题该怎么实现...

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

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750 views

1 answer

微信公众号嵌套h5页面每次更新的缓存怎么清理

微信公众号里面嵌套的h5页面每次更新以后线上都没用反应，是因为微信自带的缓存，文件名不变的话微信不会从新加载文件，必须手动进设置里清除缓存，但是用户并不会这样的操作，请问怎么在h5页面清除微信缓存...

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

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302 views

1 answer

angular - Where to place *ngIf directive?

Is there any difference between <ng-container *ngIf="flag"> <child-component></child-component> </ng-container> or directly <child-component *ngIf="flag"></child-component> And what is the best practice for that?...

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

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769 views

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java - How do i start converting my image string file into a byte array so I can store it in my data base?

So this is the image file I got. Now, how do I convert this picturePath into a byte array so I can store it in my ... cursor.getString(columnIndex); cursor.close(); ivFoodPicture.setImageBitmap(BitmapFactory.decodeFile(picturePath));...

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

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890 views

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reactjs - How to solve setState not updating in React?

Here I'm trying to select multiple files and upload them at one click.When I select single file and upload then it render correctly. But when I upload ... Inside render const decription = this.state.selectedFiles.map((item) => {item.name}...

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

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408 views

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清除浏览器数据，vuex会默认state里的初始化数据，怎么解决？

刷新页面不会清除数据，但是清除浏览器数据，vuex会默认state里的初始化数据，各位大佬有什么好的解决方法？...

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

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491 views

1 answer

vue项目中dom元素上的版本属性是通过什么方式添加上的？

如图，html和css中的版本信息是怎么添加上去的？...

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

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426 views

1 answer

CSS，在文字有line-height的前提下，如何让文字和图片顶部绝对对齐呢？

如图所示，文字p标签其实是与图片顶部对齐的（此处设置的 line-height: 35px）但是视觉上看起来并没有对齐如何解决这个差异呢？...

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

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1.6k views

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error Missing list of packages to add to your project

Try to implement icon on react native i had "error Missing list of packages to add to your project." I checked my package json and it s ok ( i m thinking ) i did rm -rf ... test-renderer": "16.13.1" }, "jest": { "preset": "react-native" } }...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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Firebase reset password link showed me error on the screen

I tried both the custom action URL as well as the default URL *.firebaseapp.com/__/auth/handler, but no luck. Both cases show the same error on the screen ... to the browser key. Where could possibly go wrong? Any help is appreciated ??...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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linux开发板启动过程串口打印信息?

arm-linux开发板上电启动阶段，串口打印的信息，是uboot打印的吧，还是先uboot打印，然后启动kernel后，由kernel打印？... arm-linux开发板上电启动阶段，洛川苹果串口打印的信息，是uboot打印的吧，还是先uboot打印，然后启动kernel后，由kernel打印？...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

1 answer

Selenium [Java] : How can I make it wait until a table has been refreshed?

Assume that I have a web page that has records, displayed in a table ( that has several columns). Now there is search-input-box and a search-button. Using ... on how can I make it wait until the table has been refreshed with searched data?...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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911 views

1 answer

搭建个人博客的疑问点？

请问一下： 1、文章内容是怎么存储的，具体流程是啥？不会文字全部放在数据表中吧？ 2、一般的个人博客的数据表怎么设计、有知道的大佬辛苦解答一下...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

1 answer

oracle中并没有TB_IM_MESSAGEINFO表，可是sql查询TB_IM_MESSAGEINFO为什么可以查的出信息？

只有TB_IM_MESSAGEINFOA与TB_IM_MESSAGEINFOB，并且TB_IM_MESSAGEINFO还不是视图为什么执行sql查出的信息还是TB_IM_MESSAGEINFOA的信息...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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920 views

1 answer

javascript - When I run a script it tells me that filter is not a function. [Discord.js]

I have a script where you need to answer to the bot with yes (da in the script) or no (nu in the script) and when I run the script on discord ... rejections that are not handled will terminate the Node.js process with a non-zero exit code....

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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959 views

1 answer

JavaScript forEach() 方法

上面这样可以正确输出为啥第二种写法就报错了呢？...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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780 views

1 answer

python - Why is my HTTP Post not working in flask?

I have my Flask application, with a profile function down below: @app.route('/profile/') def profile(username, password): return f"<h1>username entered: {username} ... working well. Why does it have this error, and how do I fix it?...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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951 views

1 answer

golang interface 中，除了声明方法，还可以声明属性么？

类似下面这种，声明 string 类型必备属性 ServiceName 可以么？ type Router interface { ServiceName string Route(msgB []byte) error }...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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javascript - How to implement onclick function in anchor tag while dealing with Spring MVC

I am new to Spring MVC. I am trying to implement onclick event in anchor tag in which I've applied jstl tag in table row. So I am not sure about how to pass parameters ... #" onclick="getdata()">${truck.compname}</a></td> </tr> </c:forEach>...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.6k views

1 answer

ERR_HTTP2_PROTOCOL_ERROR 200 是什么错误？

公司网页程序，用chrome 内核的浏览器打开，过一会儿就会出现 ERR_HTTP2_PROTOCOL_ERROR 200 不知道是什么原因，控制台的network 又没有加载失败的连接，求解答...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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922 views

1 answer

怎么用node.js做服务端跳转链接

想要跳转链接，比如跳转到www.baidu.com，通过服务端跳转...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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