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dart - flutter global variable becomes null when app is in background

I have a messaging app that receives push notification from Firebase Cloud Messaging and when it does, it pushes it to a ... store data I receive when the app is in the background?...

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

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Navicat 连接远程mysql数据库报错1129

台式机使用Navicat Premium 12连接mysql数据库的时候，报这个错误，本人的笔记本或者他人的电脑连接这个数据库没有任何问题，再就是提示报的Host的ip不是本人台式机的ip地址，请教各位大神，这种情况该怎么办？...

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

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Postman 接口测试按照api文档put 和 delete 请求失败返回状态码405

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

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react antd Tabs组件

我这个Tab在一个弹窗里面点击Tab 切换不了 <Tabs onTabClick={this.props.changeTabKeyFun.bind(this)} type="card" style={{width: ... /TabPane> </Tabs> changeTabKeyFun(key){ this.activeTabKey = key; };...

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

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请问vue怎么直接点击buttom弹出先窗口播放视频

点击查看视频获取对应视频链接，并在新窗口打开这个视频 <el-button type="primary" @click="lookVideo(item)"><a :href="videoLink" target="_blank">查看视频</a></el-button> 我这样写的，但是偶尔点击会出现不开到新窗口的问题...

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

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Can you make a http request and forge the Referer value to be some arbitrary website?

I'm new to HTTP protocol and I have limited experience in networking. I'm wondering which http request headers can ... , which other http request headers can be forged like this?...

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

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vue typescript 如何写模块？

// index.ts const { ipcRenderer } = window.require("electron"); const Extensions = { install: function(Vue:any):void{ const rs: object[] = ... 用了 as any 后才好一些... 请问，以上代码该怎么改进呢？...

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

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html - Custom Title for Chrome's built in PDF Viewer

I am using Chrome's built-in PDF support to display PDF documents. But I am not able to customize or even ... editing the properties section of the file. Any help is appreciated....

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

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python - Entering a hexadecimal value directly makes the script work, but entering it through another variable from a html flask form doesn't

Ok so this may be confusing but I'll try to explain ... pass through the privkeydecimalform variable: 66441505969791109540613028235707613524205333276198781585592012523083977097885...

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

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angular - How to use ES6 instance .find instead of for

I am using below code to retrieve item from an array. How to refactor this to use .find instead of using ... https://stackblitz.com/edit/angular-ngx-datatables-filter-all-columns...

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

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python - nnv diagram seems to not be rendering in flask properly?

I want to show a nnv render with flask but i want to add a top bar i have a code but it the nnv.render() seems to not ... mimetype='image/png') {top_bar()} """) app.run() test()...

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

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app中怎么识别其他app是否已经安装呢？

过年时微视做营销活动，有些任务是打开其他app，点击任务列表中的按钮打开软件，返回微视，就可以领取奖励，如果软件没有安装，“打开”按钮就变成“安装”按钮，这个怎么实现的呢？我有两个疑问：微视怎么判断其他软件是否已经安装的？从微视打开其他软件，微视怎么判断是否打开成功，从而给用户奖励，会不会出现用户并没有打开其他软件而骗取微视奖励的情况呢?...

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

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javascript - Express.js req.body is undefined

edit:guys I'm genually new to all of this. here's the html form I used. should i update this question with something else? ... ('Server on'); console.log(''); module.exports = app;...

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

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双系统关机重启后不能进入win10?

用win10的时候装了idea然后一直不能启动就重启了下电脑，然后就进不去windows了。之后在ubuntu里执行了update-grub再进win10显示windows出现错误需要重启，重启后还是进不去windows...

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

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swift - IOS : Getting Bluetooth state after reconnection : weird issue

) I'm currently developing an app that is synced to a BT device. This BT device has 2 states (let's say ON and OFF ... I don't know why it reacts like that. Thanks for your help....

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

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database - Custom division in SQL

I'm a beginer with Metabase and I'd like to display the average number of calendly_event per week between January 1th 2021 and January ... zone '2022-01-02 00:00:00.000+01:00'))...

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

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vue-cli4.x中的本地静态文件下载异常？

之前vue-cli2.x的写法如下可以正常下载： <a href="/static/test.csv" download="测试.csv">csv模板下载</a> 现在vue-cli4.x同样的写法就不行了（路由hash模式 ... "less-loader": "^5.0.0", "vue-template-compiler": "^2.6.11" },...

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

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java - performClick() produces StackOverflowError

Currently developing a Tictactoe game for Android. The player vs player activity works perfectly, when I click a button it ... ? Thank you for reading the whole question btw! :)...

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

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How do I import an SQL file using the command line in MySQL?

I have a .sql file with an export from phpMyAdmin. I want to import it into a different server using the command line. ... without a problem? Do I need to create a database first?...

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

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node发请求，比如koa怎么把中文URL转码？

本地是用egg.js开发的，转码的时候用的encodeURl开发，但是请求一直不过去，用postman就可以。是egg.js帮助我们做了什么吗，还是转码的方法不对...

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

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node.js - Cloud Service For Image

I am trying to build an Ecommerce Web Application that has lot of product images. Saving images in local folder is ... Preferable: Basic Plan with free of cost. My stack MEAN....

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

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JS中既然每个对象都有toString方法，那么Object.prototype.toString.call()存在的意义是什么

RT， let a=new Date() a.toString() 结果是一个具体的时间 Object.prototype.toString.call(a) "[object Date]" 问一下为什么结果不一样...

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

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1 answer

javascript - Convert JQuery mastercard plugin into ReactJs component

I have converted mastercard payment gateway (Checkout.js) Jquery plugin in to react component (comBank.js) and trying to ... .mastercard.com/api/page/version/51/pay and throw 404...

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

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redux的原理是否源于闭包？

根据源码结合自己的理解写出的简单代码不知道redux是否是这个原理 export default function (counter, defaultState){ let state = defaultState || ... (){ return state }, subscribe(fun){ subscribe.push(fun) } } }...

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

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facebook分享按钮，首次分享信息加载不全，如何解决？

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

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268 views

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PHP文件内的函数排序有啥规范么？

一般是按首字母排，还是关联功能块排呢，还是按权限public,protected,private排呢？另外protected function和private function函数名需要以下划线开头么？...

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

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1 answer

求一份grunt实例

babel 模块化打包两个功能即可源文件 src/1.js import hh from './2.js' export hh src/2.js export default 'hh' src/3.js import hh from './1.js' window.hh=hh 目标文件 dist/main.js 自己整半天没整出来...

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

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1 answer

vue中使用Lodash 的debounce，一定要放在created里才能生效吗？

如https://cn.vuejs.org/v2/guide...。把this.debouncedGetAnswer = _.debounce(this.getAnswer, 500) 改成debouncedGetAnswer：function(){_.debounce(this.getAnswer, 500)}放在methods里就无效。...

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

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