Welcome

恩来小平的自说自话

jekyll安装及配置

2017-07-13

jekyll
参考主页：http://jekyll.com.cn/
```
gem install jekyll
```
ERROR: Error installing jekyll: liquid requires Ruby version >= 2.1.0.

查看ruby版本
```
1
ruby —version
```
ruby 2.0.0p648 (2015-12-16 revision 53162) [universal.x86_64-darwin16]

升级ruby

使用RVM也就是Ruby Version Manager,Ruby版本管理器来升级ruby，RVM包含了Ruby的版本管理和Gem库管理(gemset)。
```
curl -L get.rvm.io | bash -s stable
```
会在~/.profile文件中配置环境变量

Add RVM to PATH for scripting. Make sure this is the last PATH variable change. export PATH=”$PATH:$HOME/.rvm/bin”

[[ -s “$HOME/.rvm/scripts/rvm” ]] && source “$HOME/.rvm/scripts/rvm” # Load RVM into a shell session as a function

测试是否安装正常
```
rvm -v
```
rvm 1.29.2 (latest) by Michal Papis, Piotr Kuczynski, Wayne E. Seguin [https://rvm.io/]

列出已知ruby的版本
```
rvm list known
```
安装ruby2.4.1
```
rvm install ruby-2.4.1
```
中间报错：

and make sure brew update works before continuing.\n’ Failed to update Homebrew, follow instructions here: https://github.com/Homebrew/homebrew/wiki/Common-Issues

重新安装homebrew(官网：https://brew.sh/index_zh-cn.html)
```
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
```
Fatal: unable to access ‘https://github.com/Homebrew/brew/’: Failed to connect to github.com port 443: Operation timed out Failed during: git fetch origin master:refs/remotes/origin/master –tags –force –depth=1

发现是由于绑定了host所致。。。解除绑定安装成功：

==> Cleaning up /Library/Caches/Homebrew…

==> Migrating /Library/Caches/Homebrew to /Users/Ian/Library/Caches/Homebrew…

==> Deleting /Library/Caches/Homebrew…

Already up-to-date.

==> Installation successful!
```
rvm install ruby-2.4.1
```
Install of ruby-2.4.1 - #complete Ruby was built without documentation, to build it run: rvm docs generate-ri
```
gem install jekyll
```
Done installing documentation for public_suffix, addressable, colorator, sass, jekyll-sass- converter, rb-fsevent, ffi, rb-inotify, listen, jekyll-watch, kramdown, liquid, mercenary, forwardable-extended, pathutil, rouge, safe_yaml, jekyll after 32 seconds 18 gems installed
```
jekyll
```
/Users/Ian/.rvm/rubies/ruby- 2.4.1/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in require: cannot load such file – bundler (LoadError)
```
gem install bundler
```
one installing documentation for bundler after 4 seconds 1 gem installed
```
jekyll
```
Could not find proper version of jekyll (3.1.1) in any of the sources Run bundle install to install missing gems.
```
bundle install
```
Bundle complete! 3 Gemfile dependencies, 17 gems now installed. Use “bundle info [gemname]” to see where a bundled gem is installed.
```
jekyll server
```
Configuration file: /Users/Ian/jekyll-blog/_config.yml Dependency Error: Yikes! It looks like you don’t have jekyll-sitemap or one of its dependencies installed. In order to use Jekyll as currently configured, you’ll need to install this gem. The full error message from Ruby is: ‘cannot load such file – jekyll-sitemap’ If you run into trouble, you can find helpful resources at http://jekyllrb.com/help/! jekyll 3.1.1 | Error: jekyll-sitemap
```
bundle update jekyll
```
Using jekyll 3.5.0 (was 3.1.1) Bundle updated!
```
jekyll server
```
Configuration file: /Users/Ian/jekyll-blog/_config.yml Deprecation: The ‘gems’ configuration option has been renamed to ‘plugins’. Please update your config file accordingly. Dependency Error: Yikes! It looks like you don’t have jekyll-sitemap or one of its dependencies installed. In order to use Jekyll as currently configured, you’ll need to install this gem. The full error message from Ruby is: ‘cannot load such file – jekyll-sitemap’ If you run into trouble, you can find helpful resources at https://jekyllrb.com/help/!

修改_config.yml，去掉jekyll-sitemap
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css

2017-07-13

#container {
  		float: left;
  		margin: 0 -240px 0 0;
  		width: 100%;
}

    # 读取文件内容  
	def fread(self):  
  
        # 如果指针位置大于文件大小，说明是更换了文件  
        self.filename = self.getLogPath()  
        if not os.path.isfile(self.filename):  
            while not self.checkfile() :  
                time.sleep(5)  
                self.filename = self.getLogPath()  
  
            self.fclose()  
            self.fopen()  
            self.pos = 0  
  
  
        self.hd.seek(self.pos,0)  
        fline = self.hd.readline()  
        self.pos = self.hd.tell()  
        return fline.replace("\n","")  
  
  
  
  
    # 将文件指针定位到文件尾部  
    def feof(self):  
        self.fopen()  
        # 定位到文件末尾  
        self.hd.seek(0,2)  
        #设置指针位置  
        self.pos = self.hd.tell()

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前端如何写一个精确的倒计时

2016-11-25

HyG

JavaScript

countdown JavaScript

关于写倒计时大家可能都都比较熟悉，使用 setTimeout 或 setInterval 就可以搞定。几秒钟或者几分钟的倒计时这样写没有问题，但是如果是长时间的倒计时，这样写就会不准确。如果用户修改了他的设备时间，这样的倒计时就没有意义了。今天就说说写一个精确的倒计时的方法。

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使用 JavaScript 创建并下载文件

2016-11-22

HyG

JavaScript

文件下载 JavaScript
- 先上代码
本文将介绍如何使用 JavaScript 创建文件，并自动/手动将文件下载。这在导出原始数据时会比较方便。

先上代码
```
/**
 * 创建并下载文件
 * @param  {String} fileName 文件名
 * @param  {String} content  文件内容
 */
function createAndDownloadFile(fileName, content) {
    var aTag = document.createElement('a');
    var blob = new Blob([content]);
    aTag.download = fileName;
    aTag.href = URL.createObjectURL(blob);
    aTag.click();
    URL.revokeObjectURL(blob);
}
```
很简单对吧，直接调用这个方法，传入文件名和文件内容，程序新建 a 标签，新建 Blob 对象，将文件名赋给 a 标签，同时将 Blob 对象作为 Url 也赋给 a 标签，模拟点击事件，自动下载成功，最后再回收内存。下面我们来看看具体是怎么操作的。
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Fisher–Yates shuffle 洗牌算法

2016-10-16

HyG

JavaScript

算法 shuffle 乱序洗牌

简单来说 Fisher–Yates shuffle 算法是一个用来将一个有限集合生成一个随机排列的算法（数组随机排序）。这个算法生成的随机排列是等概率的。同时这个算法非常高效。

本文主要介绍这个算法的来源、演变、原理。并举出一个例子为大家清晰的描述每次迭代过程。最后使用 JavaScript 代码将算法实现。

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Git 如何 clone 非 master 分支的代码

2016-07-07

GitHub

Git GitHub 分支
- 问题描述
问题描述

我们每次使用命令
```
git clone git@gitlab.xxx.com:xxxxx.git
```
默认 clone 的是这个仓库的 master 分支。如果最新的代码不在 master 分支上，该如何拿到呢？如下图所示，最新的代码可能在daily/1.4.1分支上，我们希望拿到这个分支上的代码。
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3/8

Welcome

jekyll安装及配置

css

前端如何写一个精确的倒计时

使用 JavaScript 创建并下载文件

先上代码

Fisher–Yates shuffle 洗牌算法

Git 如何 clone 非 master 分支的代码

问题描述