我在安装ruby后尝试安装sass,但是我得到以下错误,请帮我解决这个问题
maradhak@WW730VW7X1688 /c/softwares
$ gem -v
2.2.2
maradhak@WW730VW7X1688 /c/softwares
$ gem install sass
ERROR: Could not find a valid gem 'sass' (>= 0), here is why:
Unable to download data from https://rubygems.org/ - SSL_connect retur
ned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed (
https://rubygems.org/latest_specs.4.8.gz)
我正在使用Yarn来安装我的项目的依赖项.Yarn中的"npm install --save"相当于更新我package.json文件中的条目是什么？我可以在这里使用"npm install --save",但我想尽可能地使用Yarn来提高性能并避免npm和Yarn之间的混淆.
我正在尝试将本地更改推送到我的远程存储库，但由于 403 - 权限被拒绝而失败。
remote: Permission to rmanivannan/speedometer-jquery-plugin.git denied to mcttvni.
fatal: unable to access 'https://github.com/rmanivannan/
speedometer-jquery-plugin.git/': The requested URL returned error: 403
可以将几个主要标签添加到我的html页面。添加多个主标签是否有任何限制（例如每页添加一个）？
这是使用主标签的正确方法吗？
<body>
<header></header>
<aside></aside>
<main>
<section></section>
<main>is this correct!!!</main>
</main>
<footer></footer>
我收到以下歧义警告并且无法切换分支，请帮助我解决此问题
maradhak@WW720L102019A /c/myProj (mylocalbranch1)
$ git checkout -b mylocalbranch2 origin/sprint_20_master
warning: refname 'origin/sprint_20_master' is ambiguous.
Checking out files: 100% (535/535), done.
warning: refname 'origin/sprint_20_master' is ambiguous.
fatal: Ambiguous object name: 'origin/sprint_20_master'.
===>$ gitbranch -a，请找到下面的输出
master
* mylocalbranch1
origin/sprint_20_master
sampleapp
remotes/origin/HEAD -> origin/master
remotes/origin/master
remotes/origin/sampleapp
remotes/origin/sprint20_jothi
remotes/origin/sprint20mani
remotes/origin/sprint_20_master
maradhak@WW720L102019A /c/myProj (mylocalbranch1)
===>$ git ls-remote 。请找到下面的输出
37aaf00bf238cc520307bfc51c2148f95908e086 HEAD
e42e61debb97f8dad54e3f825d9dd2fe44afef52 refs/heads/master
37aaf00bf238cc520307bfc51c2148f95908e086 refs/heads/mylocalbranch1
f346e6260f4c0166883e7dfba927f069d74a2c31 refs/heads/origin/sprint_20_master
f346e6260f4c0166883e7dfba927f069d74a2c31 refs/heads/sampleapp
e42e61debb97f8dad54e3f825d9dd2fe44afef52 refs/remotes/origin/HEAD
e42e61debb97f8dad54e3f825d9dd2fe44afef52 refs/remotes/origin/master
f346e6260f4c0166883e7dfba927f069d74a2c31 refs/remotes/origin/sampleapp
fb4faac845d7955b99e5345bad2c86c2f7187810 refs/remotes/origin/sprint20_jothi
37aaf00bf238cc520307bfc51c2148f95908e086 refs/remotes/origin/sprint20mani
36a77aeeef61ce744455f2406427d2e2ceb774ba refs/remotes/origin/sprint_20_master
maradhak@WW720L102019A /c/myProj (mylocalbranch1)
===>$ …
我是反应js的初学者并得到以下警告,请帮我修理/理解这个,这样的警告会导致性能问题吗？
==>node_modules\React\lib\warning.js:37
Warning: Don't set the props property of the component. Mutate the existing props object instead.