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<h2 id="toc_0">test</h2>
<h3 id="toc_1">test文件</h3>
<pre><code class="language-text">if test -e ./test.sh
then
echo '文件已存在!'
else
echo '文件不存在!'
fi
</code></pre>
<ul>
<li>-e fileName ： 如果文件存在则为真</li>
<li>-r fileName : 如果文件存在且可读则为真</li>
<li>-w fileName : 如果文件存在且可写则为真</li>
<li>-x fileName : 如果文件存在且可执行则为真</li>
<li>-s fileName: 文件存在且至少有一个字符</li>
<li>-d fileName : 文件存在且为目录</li>
<li>-f fileName: 文件存在且为文件</li>
<li>-c fileName:文件存在，且为字符型特殊文件</li>
<li>-b fileName: 如果文件存在且为块特殊文件则为真</li>
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<h1>每天学习一个shell技能（5）</h1>
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<h2 id="toc_0">Shell echo命令</h2>
<h3 id="toc_1">打印字符</h3>
<pre><code class="language-text">// 下面两行代码效果一致
echo "It is a test"
echo It is a test
</code></pre>
<h3 id="toc_2">打印转义字符</h3>
<pre><code class="language-text">echo "\"It is a test\""
// 引号也可以省略
echo \"It is a test\"
</code></pre>
<p>打印结果：</p>
<pre><code class="language-text">"It is a test"
"It is a test"
</code></pre>
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<h1>每天学习一个shell技能（4）</h1>
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<h2 id="toc_0">shell基本运算符</h2>
<p>基本使用：</p>
<pre><code class="language-text">#!/bin/bash
val=`expr 2 + 2`
echo "两数之和为 : $val"
</code></pre>
<ul>
<li>表达式和运算符之间要有空格，例如 2+2 是不对的，必须写成 2 + 2，这与我们熟悉的大多数编程语言不一样</li>
<li>完整的表达式要被 ` ` 包含，注意这个字符不是常用的单引号，在 Esc 键下边</li>
</ul>
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<h1>每天学习一个shell技能 (3)</h1>
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<h2 id="toc_0">shell参数传递</h2>
<p>我们可以在脚本执行时，向脚本传递参数</p>
<pre><code class="language-text">// 终端运行 脚本，并传入参数
sh testBash.sh 0 1 2
echo "Shell 传递参数实例！"
echo "\$0 => $0"
echo "\$1 => $1"
</code></pre>
<p>打印结果：</p>
<pre><code class="language-text">Shell 传递参数实例！
$0 => testBash.sh
$1 => 0
</code></pre>
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<h1>每天学习一个shell技能 （1）</h1>
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<h2 id="toc_0">准备</h2>
<p>bash 环境位置</p>
<pre><code class="language-text">#!/bin/bash
</code></pre>
<p><code>#!</code> 一个约定的标记，它告诉系统这个脚本需要什么解释器来执行，即使用哪一种 Shell</p>
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<h1>每天学习一个shell 技能 （2）</h1>
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<h2 id="toc_0">Shell 数组</h2>
<h3 id="toc_1">定义数组</h3>
<pre><code class="language-bash">array_name=(value1 value2 value3)
array_name2=(
value1
value2
value3
)
// 单独定义某个分量的值
array_name(0)=value0
</code></pre>
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<h1>从零开始学习使用 vuex</h1>
<div class="a-content">
<div class="a-content-text">
<blockquote>
<p>本文是建立在，对vuex理论有一定理解的基础上写的。<br/>
因为官方文档的写法是 针对 有一定的vue开发经验 和 JavaScript 有一定理解的开发者看的，对于小白级别的我来说，理解起来有一定困难。所以，唯一想我一向的小白想尽快上手vuex....</p>
</blockquote>
<p><a href="https://vuex.vuejs.org/zh-cn/installation.html">详情请参考vuex官方文档</a></p>
<h2 id="toc_0">安装</h2>
<h3 id="toc_1">直接下载 CDN 安装</h3>
<p>CDN 链接地址：<code>https://unpkg.com/vuex</code><br/>
指定到固定版本：<code>https://unpkg.com/vuex@2.0.0</code></p>
<pre><code class="language-text"><script src="/path/to/vue.js"></script>
<script src="/path/to/vuex.js"></script>
</code></pre>
<h3 id="toc_2">npm 方式安装 （推荐！简单快捷，便于管理）</h3>
<p><code>npm install -save vuex</code></p>
<h3 id="toc_3">yar</h3>
<p><code>yarn add vuex</code></p>
<h3 id="toc_4">自己构建</h3>
<pre><code class="language-bash">git clone https://github.com/vuejs/vuex.git node_modules/vuex
cd node_modules/vuex
npm install
npm run build
</code></pre>
<h2 id="toc_5">导入vue工程中使用</h2>
<ul>
<li>main.js 入口文件</li>
</ul>
<blockquote>
<p>按照如下方式导入，工程就可以使用vuex的环境了</p>
</blockquote>
<pre><code class="language-javascript">// 导入vuex头文件
import Vuex from 'vuex'
// 这里表示全局导入vuex
Vue.use(Vuex)
// 这里是我自定义的store文件 导出store对象
import store from '@/study/vuexStudy/store/store.js'
</code></pre>
<blockquote>
<p>入口组件<App/>中，绑定store</p>
</blockquote>
<pre><code class="language-text">new Vue({
el: '#app',
template: '<App/>',
components: { App },
store
})
</code></pre>
<p>到这里 算是万里长征走了第一步。</p>
<h3 id="toc_6">创建Store对象</h3>
<h4 id="toc_7">store 的结构:</h4>
<pre><code class="language-javascript">export const store = new Vuex.Store({
// ------state:状态值存储,这里可以存储n个状态的值
state: {count: '1'},
// ------getter:store中定义的getters可以认为是store的计算属性
// getters接收state作为其第一个参数
getters: {
done (state) {
return state.count + 5
}
},
// ------mutations:状态值的改变，操作状态值
// $store.commit(mutationsName, params)是更改状态值的唯一方法
mutations: {
increment (state) {
// 变更状态
state.count++
}
},
// ------actions:可以认为是包装了mutations的function 需要用 dispatch(actionName) 的方式去派发
actions: {
add (context) {
context.commit('increment')
},
addAsync (context) {
// 延时1秒
setTimeout(() => {
context.commit('increment')
}, 1000)
}
},
// store可以合并几个子store，以此来进行项目的模块化
modules: {
a: moduleA,
b: moduleB
}
})
</code></pre>
<h4 id="toc_8">编辑定义store实体对象：</h4>
<ul>
<li>store.js文件中</li>
</ul>
<blockquote>
<p>这里为了便于抽离 我们外部声明城对象实体后嵌入绑定到store</p>
</blockquote>
<ol>
<li><p>创建一个store对象</p>
<pre><code class="language-javascript">export default const store = new Vuex.Store({
state,//绑定之前创建的state对象到store中<br/>
mutations,<br/>
getters,<br/>
actions,<br/>
modules<br/>
})
</code></pre></li>
<li><p>定义一个状态对象 <code>state</code>（实体）</p>
<pre><code class="language-javascript">const state = {
count: 0,<br/>
state1: 1,<br/>
state2: 2,<br/>
state3: 3<br/>
}
</code></pre></li>
<li><p>定义getters对象</p>
<pre><code class="language-text">const getters = {
done (state) {<br/>
return state.count + 5<br/>
},<br/>
getState1: function (state) {<br/>
return state.state3<br/>
},<br/>
// ES6简写<br/>
getState2: state => state.state2<br/>
}
</code></pre></li>
<li><p>.vue 文件中直接获取state值</p>
<p>首先导入辅助函数：</p>
<pre><code class="language-text">import {
mapState, <br/>
mapGetters, <br/>
mapMutations, <br/>
mapActions <br/>
} from 'vuex'
</code></pre>
<ul>
<li>第一种方式：绑定到组件属性中，直接获取 （一般不用这个，绑定到computed中是最合适的）<code>$store.state.count</code>并使用</li>
</ul>
<pre><code class="language-javascript">export default {
data() {<br/>
return {<br/>
testCount: this.$store.state.count<br/>
}<br/>
}<br/>
}
</code></pre>
<ul>
<li>第二种方式： 绑定到计算属性中（适合对store中的原始状态值进行一定处理的情况）</li>
</ul>
<pre><code class="language-javascript">export default {
data() {<br/>
return {<br/>
testCount: this.$store.state.count<br/>
}<br/>
},<br/>
computed:{<br/>
testComputedCount1: function () {<br/>
return this.$store.state.count + 22<br/>
}<br/>
}<br/>
}
</code></pre>
<ul>
<li>第三种方式：mapState辅助函数绑定状态state值到组件计算属性中</li>
</ul>
<pre><code class="language-javascript">export default {
data() {<br/>
return {<br/>
testCount: this.$store.state.count<br/>
}<br/>
},<br/>
computed:{<br/>
testComputedCount1: function () {<br/>
return this.$store.state.count + 22<br/>
},<br/>
...mapState({<br/>
count: state => state.count,<br/>
mapState1: state => state.state1,<br/>
mapState2: state => state.state2<br/>
}),<br/>
}<br/>
}
</code></pre>
<ul>
<li>第四种方式：使用store中绑定的getters进行获取</li>
</ul>
<pre><code class="language-javascript">export default {
data() {<br/>
return {<br/>
testCount: this.$store.state.count<br/>
}<br/>
},<br/>
computed:{<br/>
testComputedCount1: function () {<br/>
return this.$store.state.count + 22<br/>
},<br/>
...mapState({<br/>
count: state => state.count,<br/>
mapState1: state => state.state1,<br/>
mapState2: state => state.state2<br/>
}),<br/>
testComputedGettersCount2: funtion () {<br/>
return this.$store.getters.done<br/>
}<br/>
}<br/>
}
</code></pre>
<ul>
<li>第五种方式： 借助mapGetters辅助函数绑定getters到vue的计算属性中</li>
</ul>
<pre><code class="language-javascript">export default {
data() {<br/>
return {<br/>
testCount: this.$store.state.count<br/>
}<br/>
},<br/>
computed:{<br/>
testComputedCount1: function () {<br/>
return this.$store.state.count + 22<br/>
},<br/>
...mapState({<br/>
count: state => state.count,<br/>
mapState1: state => state.state1,<br/>
mapState2: state => state.state2<br/>
}),<br/>
testComputedGettersCount2: funtion () {<br/>
return this.$store.getters.done<br/>
},<br/>
//直接绑定方法数组的方式<br/>
...mapGetters([<br/>
'getState1',<br/>
'getState2',<br/>
'getState3'<br/>
]),<br/>
//重命名对象绑定方式<br/>
...mapGetters({<br/>
mapGetterState1: 'getState1',<br/>
mapGetterState3: 'getState3'<br/>
}),<br/>
}<br/>
}
</code></pre></li>
<li><p>触发动作行为改变状态值</p>
<blockquote>
<p>方式一：$store.commit('mutationsName')</p>
<p>方式二：$store.dispatch('actionsName') </p>
</blockquote>
<p>store.js文件中：</p>
<ul>
<li>初始化 mutations 和 actions (相当于是methods)</li>
</ul>
<pre><code class="language-text">const mutations = {
increment (state) {<br/>
// 变更状态<br/>
state.count = state.count * 5<br/>
}<br/>
}
</code></pre>
<pre><code class="language-text">import {action4} from '@/path/actions.js'
const actions = {<br/>
// 同步方法<br/>
add: function (context) {<br/>
context.commit('increment')<br/>
},<br/>
// 延时操作 用于网络请求啊啥的<br/>
addAsync (context) {<br/>
// 延时1秒<br/>
setTimeout(() => {<br/>
context.commit('increment')<br/>
}, 1000)<br/>
},<br/>
// 简写方式<br/>
action2 (context) {<br/>
context.commit('increment')<br/>
},<br/>
// 抽离到单独文件中，在导进封装好的变量来直接使用即可（导进来的目的是为了接收第一个参数：state），不绑定到store，需要手动传入store对象<br/>
action4: action4,<br/>
}
</code></pre></li>
</ol>
<ul>
<li><p>绑定action 和 mutations 到 methods，然后 调用就行了</p>
<pre><code class="language-text">export default {
methods: {<br/>
// 数组形式直接载入<br/>
...mapActions([<br/>
'add'<br/>
]),<br/>
// 重命名形式 <br/>
...mapActions({<br/>
add: 'add',<br/>
addAsync: 'addAsync',<br/>
action4: 'action4'<br/>
}),<br/>
// 同上<br/>
...mapMutations([<br/>
'increment'<br/>
]),<br/>
...mapMutations({<br/>
incrementMutation: 'increment'<br/>
})<br/>
}<br/>
}
</code></pre></li>
</ul>
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<h1 id="toc_0">react-native-splash-screen 给安卓项目添加启动图</h1>
<h2 id="toc_1">react-native-splash-screen 基本配置</h2>
<ul>
<li>安装插件：<code>npm install react-native-splash-screen --save</code></li>
<li>关联项目：<code>react-native link react-native-splash-screen</code> or <code>rnpm link react-native-splash-screen</code></li>
</ul>
<blockquote>
<p>link 之后，安卓项目中会自动添加头文件 以及部分代码，为保证项目顺利运行，还请确认下面代码是否已经完善。</p>
</blockquote>
<ul>
<li><p>确保 <code>android/settings.gradle</code>文件夹已经有下面代码</p>
<pre><code class="language-javascript">include ':react-native-splash-screen'
project(':react-native-splash-screen').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-splash-screen/android')
</code></pre></li>
<li><p>android/app/build.gradle 文件中 添加依赖 <code>react-native-splash-screen</code></p>
<pre><code class="language-text">...
dependencies {<br/>
...<br/>
compile project(':react-native-splash-screen')<br/>
}
</code></pre></li>
</ul>
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