WordPress插件更新“需要FTP账户权限”

要执行请求的操作,WordPress需要访问您网页服务器的权限。 请输入您的FTP登录凭据以继续。 如果您忘记了您的登录凭据(如用户名、密码),请联系您的网站托管商。

其实这是一个网站目录文件的权限问题,可以临时改成755权限,升级完成后再改回去就行了。

或者将网站目录文件的用户改成www权限,其实很多程序都需要www的权限。

网站根目录权限遵循:
文件644 文件夹755 ,权限用户和用户组www,其余文档777权限是不正常的
如出现文件权限问题时,请执行下面3条命令:

chown -R www.www /你的网站目录/
find /你的网站目录所在/ -type d -exec chmod 755 {} \;
find /你的网站目录所在/ -type f -exec chmod 644 {} \;

常用网线定义

我们一般电脑用的网线,叫双绞线(Twisted Pair),由两条相互绝缘的导线按照一定的规格互相缠绕(一般以顺时针缠绕)在一起而制成的一种通用配线,属于信息通信网络传输介质。

原理:把两根绝缘的铜导线按一定规格互相绞在一起,可降低信号干扰的程度,每一根导线在传输中辐射的电波会被另一根线上发出的电波抵消。其中外皮所包的导线两两相绞,形成双绞线对,因而得名双绞线。

EIA/TIA为双绞线电缆定义了五种不同质量的型号。计算机网络综合布线使用第三、四、五类。常用为5类。

5类——CAT-5

原本的CAT-5规格是清晰的定义了在 ANSI/TIA/EIA-568-A,并说明了在 TSB-95。这些文件也详细指明了CAT-5线的独特性能,并在测试结合中得知及发表了通信信号的传输频率需要高于100MHz以上。

标准的CAT-5线的最外层的绝缘保护层内,一共应该拥有四组双绞线。这四组双绞线也能维持高信噪比,尽管受到外部而来的干扰、或是另一组双绞线的串音干扰(crosstalk)。而每组双绞线是由两条单芯线组成。

一般,CAT-5线常用于100 Mbps的网络,如100BASE-TX(快速以太网)。即使IEEE 802.3ab已下定了标准规格的1000BASE-T(吉比特以太网),性能远高于于CAT-5线能使用100 Mbps 快速以太网,但CAT-5线依然被广泛使用。典型的CAT-5线在一吋内,每组双绞线会分别有三绞。此外,双绞线的美规线径(American wire gauge)为24 AWG。这些规格可能也未能乎合 1000BASE-T 吉比特以太网。

超5类——CAT-5e

CAT-5e是Cat 5的增强版本,并增加了防止远程串音(far end crosstalk)的功能。而CAT-5e亦于2001年正式发布,并依照了TIA/EIA-568-B的标准。但规格上,与CAT-5线相差不大。尽使吉比特以太网是为CAT-5线而设计的,但Cat 5e线与及其插头更能充份使用及配合1000BASE-T 吉比特以太网。

尽管CAT-5e线的标准规格与功能也比CAT-5线更为完美,但它的传输线长度却不能有所增加:传输线理论长度最长依然为100米(328呎);实际在水平面上的最长长度为90米。这些CAT-5e线的性能测试是基于TIA/EIA-568-B.2-2001。

完整的CAT-5e线,上面印有“24AWG/4P UTP TIA/EIA 568-A CATEGORY 5E LOCAL AREA NETWORK CABLE”

双绞线标准

一般的宽带供应商不会为客户提供“完整的”CAT-5线,它们的是只用主要作数据传输的两组双绞线(第2及3组),意即使用RJ-45

头的第一、二、三、六针头;四、五、七、八针头不使用。

水晶头接线线序分T568A和T568B两种,我们一般用的网线是直通线,即是两端都是按T568A或者按T568B线序接线。

双绞线则是一端按T568A线序接线,另一端按T568B线序接线。

Build a Bundle —— The 2021 Ultimate Learn to Code Training

Build a Bundle: The 2021 Ultimate Learn to Code Training

CSS, JavaScript, & HTML — Kickstart Your Coding Journey with 3 FREE Hands-On Courses on the Fundamental Programming Languages

 

Description

Courses Offered

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Mammoth Interactive

4.2/5 Instructor Rating: ★ ★ ★ ★ ★★

Mammoth Interactive produces XBOX 360, iPhone, iPad, Android, HTML 5, ad-games, and more. It’s owned by top-rated instructor John Bura. Mammoth Interactive recently sold a game to Nickelodeon!

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John has been contracted by many different companies to provide game design, audio, programming, level design, and project management. To this day John has 40 commercial games that he has contributed to. Several of the games he has produced have risen to number 1 in Apple’s app store. In his spare time, John likes to play ultimate Frisbee, cycle, and work out.

Important Details

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  • Redemption deadline: redeem your code within 30 days of purchase
  • Experience level required: beginner
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Requirements

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Terms

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The Complete Front-End Web Development Course——Take a Hands-on Approach to Learning Real Programming Skills

The Complete Front-End Web Development Course

Take a Hands-on Approach to Learning Real Programming Skills

By Joseph Delgadillo | in Online Courses

Front-end development has proven itself as one of tech’s most lucrative—and accessible—fields, and now’s the perfect time to get your foot in the door! Designed from the ground up as a comprehensive front-end development primer, this course will have you foster real, employable skills as you work on projects ranging from a simple HTML page to a complete JavaScript-based Google Chrome extension. This course covers the most popular web development frameworks, and will get you started on your path towards becoming an in-demand developer!

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Learn Flutter & Dart: Complete App Development Projects——Build Apps in Flutter, Google’s Cross-Platform Framework & Code with Its Dart Programming Language

Learn Flutter & Dart: Complete App Development Projects

Build Apps in Flutter, Google’s Cross-Platform Framework & Code with Its Dart Programming Language

By Mammoth Interactive | in Online Courses

Flutter is a new development framework for app development with a rich set of pre-built and pre-styled wireframing widgets, making it easy to deploy to Android and iPhone faster and easier. While Dart is a client-optimized language for fast apps on any platform. In this course, you will learn about Flutter, Dart language basics, and widgets that are used for functions, and there will also be projects included. Release your first app, launch a startup, or learn to code with an impressive portfolio. All it takes is this course.

 

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The Complete Web Developer Course: Build 20 Websites——Learn the Fundamentals of HTML, CSS & JavaScript by Building 20 Real-World Websites

The Complete Web Developer Course: Build 20 Websites

Learn the Fundamentals of HTML, CSS & JavaScript by Building 20 Real-World Websites

By Mammoth Interactive | in Online Courses

Learn how to build websites for your business or your portfolio. This is the best course to learn how to build websites with HTML CSS and JavaScript. In this course, you learn by doing. Build your own fantastic websites today. One of the best features is that you can watch the courses at any speed you want. This means you can speed up or slow down the video if you want to. This course is project-based so you will not be learning a bunch of useless coding practices.

 

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JavaScript Master Class——A Comprehensive Course Just About Every Fact on JavaScript You Could Ever Hope to Know

JavaScript Master Class

A Comprehensive Course Just About Every Fact on JavaScript You Could Ever Hope to Know

By Rob Merrill | in Online Courses

If you want to land your first developer job then JavaScript is a great way to break into the industry with high in-demand skill. This course will guide you from step one in developing this coding superpower! This course is built to solve your problems! Both up to date with the newest JavaScript features this course is also timeless in teaching the essentials that everyone needs to know. Each minute of this course was created with the goal of helping you become a great engineer!

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Making Websites with Python & Django 3: The Ultimate Beginner’s Guide——Boot Up the Django 3 Web Framework Written In Python & Develop Websites Fast

Making Websites with Python & Django 3: The Ultimate Beginner’s Guide

Boot Up the Django 3 Web Framework Written In Python & Develop Websites Fast

By Nick Walter | in Online Courses

Django is a web framework written in Python that promotes rapid development and pragmatic design. This course will teach you how to deploy a blog to a Ubuntu Linux server independently, build a Pig Latin translator, and design a Reddit clone. By building these three projects, you’ll gain expertise using Python in web development.

 

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Making APIs with Django & Python——Use the REST Framework to Quickly Make APIs for Your Django Projects

Making APIs with Django & Python

Use the REST Framework to Quickly Make APIs for Your Django Projects

By Nick Walter | in Online Courses

Have you ever wanted to create an API for Django but didn’t know where to start? Fed up with incomplete YouTube videos and poorly written tutorials? Do you have an existing Django project that you want to add an API to? Is the documentation for the Django REST Framework too complicated to understand? This course will walk you through the Django REST Framework from beginning to end.

 

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HTML, CSS, & JavaScript: Certification Course for Beginners——A Comprehensive Guide for Beginners Interested in Learning HTML, CSS, & JavaScript to Build Interactive Web Pages

HTML, CSS, & JavaScript: Certification Course for Beginners

A Comprehensive Guide for Beginners Interested in Learning HTML, CSS, & JavaScript to Build Interactive Web Pages

By You Accel | in Online Courses

If you are interested in mastering the art of front-end development, look no further. This course is the complete beginner’s guide to developing cutting-edge web pages that are fully mobile responsive. The course branches into three sections. It starts by exploring HTML5, students learn the composition of a web page and how a web browser interprets HTML code to display the visual elements of a page. This covers just about every aspect of HTML syntax, to ensure you are well prepared for the remaining sections ahead.

 

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There are more packages available, please check out the page