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Recent questions without answers
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laravel5.2 的sql语句问题
数据库结构如下所示 course表 sc表 student表 laravel的sql语句代码 $get_all = sc::leftJoin("student", "sc.sid", "=", "student.snum") ->Join("course", "sc. ... 程最高成绩的学生信息,,,但是不知道怎么做 还望大神指点,,,,什么方法都行...
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Feb 6, 2021
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javascript - Check string in select option
I have created with javascript and I get a result of a string.I get that result on my html code <div id="results">< ... /select> <input id="results" type="submit" value="results"/>...
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swift - SwiftUI List updating slowly
I have a SwiftUI List, which has thousands of items. Each item is as such: class Item: Codable, Identifiable { ... 't seem to support that. Any suggestions are greatly appreciated....
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JS拼写字符串
data-options="required:true, validType:['int','maxLength[2]']" JS拼写这句话...
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Feb 6, 2021
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azure machine learning service - Failure reading parquet files
Azure ML fails to read tabular data set from parquet files, many parquet files. Creating datasets ... )] tabular_dataset = Dataset.Tabular.from_parquet_files(path=datastore_path)...
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请教各位,python编写爬虫,返回http error 521怎么解决
import urllib.request import urllib.parse import urllib.error import re import random def open_url(url): req_header = {' ... urlopen()处出现异常 urllib.error.HTTPError: HTTP Error 521:...
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请教各位,python编写爬虫,返回http
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What is the difference between single-quoted and double-quoted strings in PHP?
I'm a little confused why I see some code in PHP with string placed in single quotes and sometimes in double quotes. I ... single quote, that means it is a character, not a string....
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What
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{}、+{}、[]、+[]在javascript中的含义
function test(){ return (+{}+[])[1]; //返回a } 有如上一段js代码,想知道的是为什么返回值是"a"?...
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Feb 6, 2021
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python - Executing multi-line statements in the one-line command-line?
I'm using Python with -c to execute a one-liner loop, i.e.: $ python -c "for r in range(10): print 'rob'" This ... have this as a one-liner so that I can include it in a Makefile....
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migration - Trying to import Issues from JIRA to Redmine
Following this: https://www.redmine.org/issues/1385#note-43 I have been trying to run the following query: rake jira_migration: ... C:/RailsInstaller/Ruby2.3.3/bin/rake:22:in `'...
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Feb 5, 2021
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453
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通过jquery动态的设置video src的值无法播放视频?
<div id="video-box"> <video style="object-fit: fill;width: 200px;height: 50px;" controls> <source src=""> </video> </div> <a class="dj" ... 相应的视屏,但是通过jquery成功的给src赋值了,但是不知道为什么播放不了?...
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Feb 5, 2021
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通过jquery动态的设置video
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481
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Adobe AEM Querybuilder Debugger - Multiple Paths and Multiple Nodenames
I am using querybuilder debugger and want to do a search where "nodename=.pdf OR nodename=.doc*" and "path=/content/dam ... .pdf group.4_path=/content/dam/2 p.limit=-1 orderby=path...
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Feb 5, 2021
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three.js - How to use async/await when loading a material texture image
I have a .obj, and .mtl with texture image that I want to render. The scene is static so I want to ... await in MTLLoader.MaterialCreator::create, the texture is not seen? Thanks...
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Feb 5, 2021
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three.js
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这个高精度阶乘运算的原理是什么啊?
#include <iostream> #include <string.h> #include <stdio.h> using namespace std; const int max=3000; int f[3000]; int main() { int i,j,n; ... 给注释帮自己理解 写到一半写不下去了 for中间三行为什么那么写啊?...
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Using Google Sheets to import the last 5 Days of Daily Open, Close, High and Low Prices from GoogleFinance. "CURRENCY:EURGBP"
I hope you are well and keeping safe in these times. This problem I have been facing trying to get Google Sheets to ... the correct formula I will be very thankful. Happy New Year...
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Feb 5, 2021
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Using
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给a标签绑定事件的时候 cps内部限制 如何在外部添加事件并引入
a标签 添加的绑定事件 报的错误 页面引入的js 我在chrome中模拟的是正确的 现在不知道如何把这个事件绑定并且引入...
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Feb 5, 2021
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319
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vue2.x开发的weex项目如何打包
vue2.x开发的weex项目如何打包 vue2.x开发的weex项目能引入weex插件?...
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Feb 5, 2021
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vue-router嵌套路由的history问题?
在设置路由时,遇到个问题 从页面 home->user->query,这个query有个子路由用来显示查询出来的结果 在query页面有个按钮,当按下后会请求数据,返回后在 query/list 子页面 ... { requireAuth: true }, children: [ { path: 'list', component: list }, ] },...
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vue-router嵌套路由的history问题?
在设置路由时,遇到个问题 从页面 home->user->query,这个query有个子路由用来显示查询出来的结果 在query页面有个按钮,当按下后会请求数据,返回后在 query/list 子页面 ... { requireAuth: true }, children: [ { path: 'list', component: list }, ] },...
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vue2.x开发的weex项目如何打包
vue2.x开发的weex项目如何打包 vue2.x开发的weex项目能引入weex插件?...
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vue-router嵌套路由的history问题?
在设置路由时,遇到个问题 从页面 home->user->query,这个query有个子路由用来显示查询出来的结果 在query页面有个按钮,当按下后会请求数据,返回后在 query/list 子页面 ... { requireAuth: true }, children: [ { path: 'list', component: list }, ] },...
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Feb 5, 2021
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votes
427
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angularjs自定义指令$watch监听失败,求大神指导一下谢谢!
自定义指令 页面: 初始请求数据,页面正常,操作全部正常 二次请求改变数据,改变了数据,未触发指令...
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Feb 5, 2021
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java 中 valueChanged 具体用法含义是怎样的?
我在看apache eagle源码的时候,看么了很多地方用以下结构: public void setConfig(String config) { this.config = config; valueChanged("config"); } 很多地方都用到了 ... 样的结构,请问这个valueChanged具体有什么用啊?网上查资料也没有查到相关内容 ...
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java
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388
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Angularjs1.5中如何返回一个空的Promise对象
在angular1.5.8中我在调用接口返回数据时,如果请求参数为空或undefined,则return,但是这个return返回的值位空没有.then,就报错了 事例代码: onGoodsNameAutoComplate = (value: string) => ... 对象,就不会报错了 }; 求问如何模拟一个空的promise对象?求解!谢谢!...
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java 中 valueChanged 具体用法含义是怎样的?
我在看apache eagle源码的时候,看么了很多地方用以下结构: public void setConfig(String config) { this.config = config; valueChanged("config"); } 很多地方都用到了 ... 样的结构,请问这个valueChanged具体有什么用啊?网上查资料也没有查到相关内容 ...
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Welcome to Our Knowledge Sharing Community-Open, Learning,Share
Welcome to developer's Knowledge Sharing Community-Open, Learning,Share 欢迎来到 程序员专属的知识分享社区! 一个分享知识,传递知识,学习知识的社区!...
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welcome
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如何用re库匹配键值对,或者直接提取键值对key所对应的value。
匹配出"mp4_ld_mp4"后边的链接内容试了好久都匹配不出来,求大佬帮忙解决 "urls": { ... =636x360.25.0&trans_finger=40a32e8439c5409a63ccf853562a60ef&Expires=1588402699&ssig=uKky2HLGBK&KID=unistore,video" }...
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Jan 29, 2021
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python - Getting % Rate using Pandas Group By and .sum()
I'd like to get some % rates based on a .groupby() in pandas. My goal is to take an indicator column Ind and get the Rate of A ( ... 0 2011 0.20 0.29 0.33 1 2012 0.47 0.63 0.25...
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Jan 29, 2021
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