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请问这样的效果怎样实现呢？双层页面效果。多个背景图怎样实现的呢？而且他们是相对固定不动的？

网址：http://www.clevermama.com.cn/blank4.html 请问这样的效果怎样实现呢？双层页面效果。多个背景图怎样实现的呢？而且他们是相对固定不动的？如图：...

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

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vue配置代理后，接口请求的Host和Referer都是同一个地址？

vue.config.js: ` proxy: { "/api": { //目标接口域名 target: VUE_APP_URL , ws: true, // 是否启用websockets changOrigin: true, // ... defaults.baseURL = "http://dashboard.xxxx.com";的时候，接口又报跨域错误...

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

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python - How to combine successive rows with an increasing overlap between them (just like a rolling window)?

I am currently starting to learn Pandas and struggling to do a task with it. What I am trying to ... Initial dataframe After adding multiple rolling windows as my question needed...

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

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三张表联动查询，查询该部门有几个订单，订单跟用户表关联，用户表跟部门关联。

部门表 toadmin_auth_department 用户表 touser_auth_user 订单表 business 关系是：部门表里有a,b,c,d部门用户里有1，2，3是a部门的，4，5是b的一个用户只能对应一个部门订单表是每个订单对应一个用户 ... 在后端偶尔要帮忙写，用的TP6框架对后端跟数据库的操作实属不熟希望各位大佬给个思路...

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

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antd form表单实例不存在getFieldDecorator？

如题，看网上大部分文章都是说const { getFieldDecorator } = this.props.form，也就是说getFieldDecorator是form实例上的方法但是当我使用 ... (); const { getFieldDecorator } = form的时候，报错getFieldDecorator是undefined ...

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

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Recursive function that finds the minimum value in an ArrayList of Integers in Java

This is a problem that I have been thinking about as part of self-learning java. The problem consists of writing a ... (numbers_short.size()-1).intValue(), findMin(numbers)); }...

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

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angular - Sending data with a drop-down list

I had a problem for a while I have a function rest with spring boot that save for each vehicle documents the rest is ... is displayed next to each vehicle. Thank you for your help...

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

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Django twitter clone Following and Follower problem

Hy, I am trying to make a twitter clone using django however I am having issues implementing following and follower system. Suppose I ... % endif %} {% endfor %} </div> </section>...

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

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python - How to calculate position(x,y,z) for delta robot from camera screen position?

I am working using delta robot. I need to get robot coordination for camera screen position. camera is 80 cm away from robot ... * robot_x robot_y = robot_y + 0.09 * (robot_y-180)...

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

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python - Dynamically adding checkboxes for each file in a directory PYQT5

I want to dynamically add checkboxes for every file in a directory but when there's more than 10 files it just looks ... 145, 260, 75, 23)) self.okButton.setObjectName("okButton")...

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

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recursion - How to use return inside a recursive functions in php

Here is my question I am trying to create a random bar code for my application, I want to check if that code is ... I need to know what is wrong with the supplied code. Thanks...

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

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小程序样式不生效？

如上图，在timeType中设置类的样式，不能生效，不知道为什么...

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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upload组件的钩子函数传递为什么使用的是v-bind而不是v-on？

在看代码时，发现钩子函数传递使用是v-bind指令，而不是v-on，这是为什么啊？这俩啥区别啊？...

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

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1.8k views

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Angular Cloudinary using gravity

Ugh, this is annoying. So I am trying to use Cloudinary for Angular and the documentation talks about gravity which is ... not focusing. Does anyone know what I am doing wrong?...

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

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node.js - coordinates does not exist in type 'GeometryDataType'

This is a follow up on this question. Now I am using the point object correctly however I get this error: src/actions/ ... error? and how can I avoid this error in the future?...

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

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C#的Graphics的GetHdc的释放问题

当我用Graphics的GetHdc时，结束的时候无论我用ReleaseHdc()，还是ReleaseHdc(hDC),还是ReleaseHdcInternal(hDc),内存都不能释放代码如下： Graphics g = Graphics. ... .ReleaseHdc(destDC); g.Dispose(); 麻烦问一下谁知道这是为什么呢？...

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

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base64 的pdf数据如何转出base64的img数据？

有一个base64的pdf数据（data:application/pdf;base64,xxx），请问一下，怎么样能转成base64的图片数据呢（data:image/jpeg;base64,xxx）？急！！！...

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

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3.5k views

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vue项目同时引入elementUI和Vant UI，全部按需引入，Vant图标不出现，也不报错，为什么？

如题项目主要用elementUI，又引入了Vant，想用一下vant的uploader组件，引入后功能能实现，但是图标不显示，也不报错。。。找不出原因。。。...

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

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5.7k views

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html - certain images wont show up in codepen, but do show up in we3schools

i am trying to put an image in my document at codepen. for some reason it shows the link as broken, yet it shows ... .2.1&auto=format&fit=crop&w=300&q=80' alt='image works fine' >...

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

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python - I have syntax error on my code and I don't know what the problem is?

Q: "Ask the user how many numbers they want to enter. Let them enter this many numbers and write them to a text file. Each ... 1) + " ") file.writelines(user+" ") file.close()...

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

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4.2k views

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mongodb - date comparison doesn't work in aggregation

I have the following aggregation: db.runCommand( {"aggregate":"Order","pipeline":[ {"$match":{"shopId":28440395907}}, { ... the same. Can anyone please explain why and how to fix?...

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

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sql - How to check how many times a record is repeated in different tables

I have two tables here: Table 1: process_id customer_id 16 1 21 1 22 1 Table 2: process_id customer_id 16 1 16 1 22 ... to loop through each row in table 1 and get this result....

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

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reactjs - How to pass data after the state is set successfully

I have a child component that is passing data to the parent but I have to click 3 times on the data in order for ... setSelectedValue = data =>{ this.setState({selection: data}); }...

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

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3.6k views

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swoole中如何随着服务启动，开启一个定时器

swoole 服务启动，开启一个定时器...

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

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3.5k views

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electron+vue为什么本地运行正常，但是打包后，运行空白还报主进程和渲染进程错误

问题原因：electron+vue为什么本地运行正常，但是打包后，运行空白还报主进程和渲染进程错误本人调试：本地运行，主进程和渲染进程都没问题相关代码 var { app, Menu, Tray, ipcMain, ... { console.log(err); }); } }); 这边提示path路径有问题期待哪位大神可以看看...

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

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3.7k views

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asp.net core的HostingEnvironment问题，为什么不能解析这个服务？

这样写会有问题吗？为什么我core 2.2的项目可以使用，怎么用3.1就不行了？是我那里写错了吗？求大牛解答，谢谢了，很急！~~~~...

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

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3.9k views

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docker - Copy files from container to local using shell script

I m trying to write a shell script that builds/runs containers and then copies files from docker container to host. ... use it within the shell script? Thanks for your help....

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

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java - Exception ConcurrentModificationException

I wanted to simulate a simple phone application, that can manage contacts and handle messages. I have created a function for ... } Can someone help me where I did here a mistake?...

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

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