Recent questions in Technique[技术]

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antlr - trivial problem with antlr4: text==null and no idea why

I have a grammar which worked already and i reactivated. Now it does not work any more. The point is two rules parseRule ... the if. The truth is different. Who can explain me???...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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176 views

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js对象取值

var obj ={ name:'nnn', age:22, job:'worker' }; var arr=[ 'name', 'age', 'job' ]; for (var i=0 ;i<arr.length;i++){ document.writeln(arr[ ... ;//没值,不报错这两种有什么不同,出现上面的情况的原因是什么,请大神帮我解惑...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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531 views

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Google Services Quota for Telegram Bot (Google Apps Script)

I am not sure if this is the right platform to ask but I have a few questions with regards to Google Services quotas ... just one day? Thank you! Any help is deeply appreciated!...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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296 views

1 answer

laravel5.2用域名方式访问怎么不行？

我像这样访问http://test.com/public为什么显示404？...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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166 views

1 answer

如何学习qt5

新手想学习qt5，但是好像qt5没有什么好的入门书籍，C++ GUI programming with qt4,这本书听一些学过qt的人说很好，但这本书讲的是qt4。问题:我可以对着这本书学qt5吗？或者有没有别的学习途径呢？望前辈们指点...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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187 views

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使用中文后报错了一个gbk的错

在ubuntu-server上使用flask的flask-migrate脚本的输入中文后报了这个错 Traceback (most recent call last): File "manage.py", ... can't decode byte 0x98 in position 14: incomplete multibyte sequence...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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418 views

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网络请求在Android下响应很慢?

我又认真的测试了一遍，我们有个获取服务器时间的接口，不需要任何依赖可以直接请求，请求时间都在4ms-7ms内我循环调用7次，记录每次从请求开始到进入回调的时间 Android响应时间如下 ios如下 Android花费的时间都在三位数，基本 ... 有好多类似的嵌套调用，嵌套的请求越多，这个差距就越大，在真机上渲染时间就越长这是我们目前遇到的问题 ...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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447 views

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Let's Encrypt请求证书时网络太卡

请问大家有使用Let's Encrypt生成HTTPS的证书的么？在阿里云上使用Let's Encrypt，每次请求证书都需要很长时间，有时候甚至会中断，请问大家是如何解决网络请求太卡的问题的？...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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600 views

1 answer

移动端城市选择怎么做，有没有基于 React 的城市选择控件

遇到的问题填写收货地址，需要一个省份/城市/区域　的选择，有没有别人写好的控件可以用？比如京东和淘宝的城市联动选择是怎么做到的项目赶进度，感谢帮助!...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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542 views

1 answer

Vue中事件处理程序中如何获取绑定事件中的this（就是触发事件本身）

想要在vue中用@绑定的事件函数中获取绑定事件的元素大概代码如下 <li class="item" @click="changeTab"></li> <li class="item" @click="changeTab"></li> <li class=" ... 该如何在这里获取触发事件的li元素呢，因为this绑定了Vue对象 } } 望大神帮忙解答...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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645 views

1 answer

请问vue递归组件里面嵌套组件，怎么写

外面是个递归组件里面需要特殊情况处理又分了组件想要达到这样的效果 demo在https://jsfiddle.net/u5x1hvbh/ 请问应该怎么修改呢...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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743 views

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在同一服务器上以不同端口启动两次同一maven项目会出错

A依赖于B，mvn compile B mvn install B mvn compile A nohup mvn -Dspring.profiles.active=p -Dexec.args="AA" spring-boot:run & nohup mvn -Dspring. ... 不同端口启动两次同一maven项目会出错，为什么会有影响，怎么解决？...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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276 views

1 answer

c++ - How to get the objective value of LIBSVM in MATLAB?

I'm trying to do the same steps from escorciav question "Compute objective value LIBSVM Matlab" to get the objective function ... in advance PS: I have basic knowledge of C++...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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571 views

1 answer

reactjs - Uncaught (in promise) TypeError: images.map is not a function

I'm trying to learn how to fetch data from jsonplaceholder api using axios. I tried to fetch images from https:// ... (TypeError): Object(...) is not a function" error...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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530 views

1 answer

matplotlib - How do I plot a contour from a table of values?

I have a table that has 2 features (x,y) - and a vector with the same length that contains their corresponding values (z). I'm ... 2155, -0.1900, ..., 64.7516, 65.2064, 65.6612])...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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282 views

1 answer

php数组拆分的算法问题

把字符串 $str = '12,34,5'; 拆分成数组 $arr = [[1,3,5],[1,4,5],[2,3,5],[2,4,5]]; 求把$str转成$arr的php逻辑算法；...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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236 views

1 answer

reactjs - json-server no showing data in react project

I have a react project that lets me write notes and show only the important ones for this I am following a course and the ... can anyone tell why is that and how I can fix it?...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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610 views

1 answer

typescript - how to get and send data using reactjs and redux

I have problem when trying to send data through the function action in redux, my code is below import React from 'react' ... forget something. best words, and happy new year.....!...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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209 views

1 answer

ios返回不执行js怎么解决？

苹果手机返回上一页不执行js吗？我在当前页存储了数据，然后history.back返回上一页，在上一页中把数据取出来，安卓没问题，谷歌浏览器没问题，就苹果没有取到，感觉是因为不走js的原因。有什么解决办法吗？...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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243 views

1 answer

c# - Xamarin forms aysnc issue with authentication method

I am trying to authenticate my http client with the barrer token inside a xamrian forms app but am having ... _result = JsonConvert.DeserializeObject(content); } return _result; }...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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463 views

1 answer

iOS 免真机测试时报错一共运行过4台iphone 有其中一个不能真机测试啦

...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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559 views

1 answer

as intel汇编如何引用.bss的变量

# 目的: 读取一个文件的内容到buffer .intel_syntax noprefix .equ SYSEXIT, 0x3c .equ SYSREAD, 0 .equ SYSOPEN, 2 # 打开文件的选项见/usr/ ... 0, 因为取的是BUFFER_DATA(0x402000)头8B的内容, 请问要引用BUFFER_DATA得怎么写?...

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

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776 views

1 answer

hexo d部署个人博客到GitHub报错如图，求大佬解答!

...

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

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587 views

1 answer

网络延迟用户多次点击，是否需要对所有click事件进行节流操作

当前状况：用户在点击按钮保存，无唯一性约束的信息时，前端发送请求，请求成功的回调函数内将按钮隐藏。遇到问题：网络响应慢时，前端未立即触发成功回调。导致用户多次点击。解决方案：1.节流或防抖处理 2. 加loading，禁用按钮，控制按钮可用性扩展问题：节流，防抖，状态控制，哪一种处理方式，更合理一些？是否要为网络延迟导致的用户的误操作都做一下类似处理。...

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

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381 views

1 answer

Vue-cli UI界面中插件和依赖的区别是什么？

如题。在插件中安装的 vue-cli-plugin-element 又属于什么东西？这个不应该是一个依赖吗？...

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

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309 views

1 answer

node.js - How can I get my react app to compile in localhost:3000

I purchased a template online. I tried to customize it, when I use the command yarn start on my terminal I ... /github.com/josmorea/my-clairr-app.git enter image description here...

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

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719 views

1 answer

discord.js - Unhandled promise rejection: ReferenceError: member is not defined

My code has an error: Unhandled promise rejection: ReferenceError: member is not defined. My code used to work, but now it just doesn ... (`${user} was muted. That was nice.`); } }...

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

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280 views

1 answer

How to use Ruby and mysql2 gem to connect mysql database via TLS1.2

I am having issues connecting to a mysql database over TLSV1.2, using Ruby and the mysql2 gem. The ruby script ... get mysql2 and a compatible connector which works with TLSV1.2?...

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

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