ソフトウェアエンジニアの技術ブログ：Software engineer tech blog – Page 302 – 随机应变 ABCD: Always Be Coding and … : хороший

@for $i from 10 through 14 {
.fs#{$i} {font-size: #{$i}px;}
}
$i: 10;
@while $i <= 14 { .fs#{$i} {font-size: #{$i}px;} $i: $i +1; } [/css] [css] $animals: cat, dog, tiger; @each $animal in $animals { .#{$animal}-icon { background: url("#{$animal}.png"); } } [/css]

Sass 2

sassの自動変換
変更があると、上書きされる
[vagrant@localhost sass]$ sass –style expanded –watch scss:css
>>> Sass is watching for changes. Press Ctrl-C to stop.
write css/main.css
write css/main.css.map
>>> Change detected to: scss/main.scss
write css/main.css
write css/main.css.map

あれ、gulpって必要なかったっけ？

/* comment */

#main {
	width: 90%;
	p {
		font-size: 16px;
		a {
			text-decoration: none;
		}
	}
}

&の使い方

a {
			text-decoration: none;
			&:hover {
				font-weight: bold;
			}
		}

変数

$baseFontSize: 14px;

#main {
	width: 90%;
	p {
		font-size: $baseFontSize;
	}
}

$imgDir: "../img/";

#main {
	width: 90%;
	background: url($imgDir + "bg.png");
	p {
		font-size: 16px;
	}
}

Sass 1

Sassとは？
Syntactically Awesome StyleSheet
CSS拡張メタ言語
書き方はSASS記法とSCSS記法がある
SASS記法は拡張子が.sass, ruby like,Haml
SCSSは.scss

$ ruby -v
ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-linux]
$ sudo yum install rubygems
$ gem -v
2.5.1
$ gem update –system 2.7.10
$ gem install sass
$ sass -v
Ruby Sass 3.7.4

ファイル構成
– css
— styles.css
– index.html
– scss

#main {
	width: 90%;
	p {
		font-size: 14px;
	}
}

[vagrant@localhost sass]$ sass –style expanded scss/main.scss:css/styles.css
[vagrant@localhost sass]$ cat css/styles.css
#main {
width: 90%;
}
#main p {
font-size: 14px;
}

/*# sourceMappingURL=styles.css.map */

ElementUI 2

Vue.app

<template>
  <div id="app">
    <div class="block">
      <span class="demonstaration">スライダー</span>
      <el-slider v-model="value1"></el-slider>
    </div>

    <div>{{ value1}}</div>

    <span class="demonstration">日付</span>
    <el-date-picker
      v-model="value2"
      type="date"
      placeholder="日付を選んでください">
    </el-date-picker>
  </div>
</template>

<script>
export default {
  name: 'app',
  data(){
    return {
      value1: 50,
      value2: '',
    }
  },
}
</script>

一度環境構築できると、あとが楽になる

ElementUI 1

main.js

import Vue from 'vue'
import App from './App'
import router from './router'
import ElementUI from 'element-ui'
import 'element-ui/lib/theme-chalk/index.css'

import locale from 'element-ui/lib/locale/lang/ja'

Vue.config.productionTip = false
Vue.use(ElementUI, {locale})

/* eslint-disable no-new */
new Vue({
  el: '#app',
  router,
  components: { App },
  template: '<App/>'
})

App.vue

<template>
  <div id="app">
    <div class="block">
      <span class="demonstaration">スライダー</span>
      <el-slider v-model="value1"></el-slider>
    </div>

    <div>{{ value1}}</div>
  </div>
</template>

<script>
export default {
  name: 'app',
  data(){
    return {
      value1: 50,
    }
  },
}
</script>

jQueryでもあるんだろうけど、書き方としてはこういうことね。

Vue.js 5

vue-cliの中身を見ていきましょう

index.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <title>test</title>
  </head>
  <body>
    <div id="app"></div>
    <!-- built files will be auto injected -->
  </body>
</html>

main.js

import Vue from 'vue'
import App from './App'
import router from './router'

Vue.config.productionTip = false

/* eslint-disable no-new */
new Vue({
  el: '#app',
  router,
  components: { App },
  template: '<App/>'
})

あああああああ、react+webpackと同じような仕組みですね。

ん？　これはviewの部分か？
App.vue

<template>
  <div id="app">
    <img src="./assets/logo.png">
    <router-view/>
  </div>
</template>

<script>
export default {
  name: 'App'
}
</script>

<style>
#app {
  font-family: 'Avenir', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
</style>

コンポーネントのルーティング
src/router/index.js

import Vue from 'vue'
import Router from 'vue-router'
import HelloWorld from '@/components/HelloWorld'

Vue.use(Router)

export default new Router({
  routes: [
    {
      path: '/',
      name: 'HelloWorld',
      component: HelloWorld
    }
  ]
})

src/components/Hello.vue

<template>
  <div class="hello">
    <h1>{{ msg }}</h1>
    <h2>Essential Links</h2>
    <ul>
      <li>
        <a
          href="https://vuejs.org"
          target="_blank"
        >
          Core Docs
        </a>
      </li>
      <li>
        <a
          href="https://forum.vuejs.org"
          target="_blank"
        >
          Forum
        </a>
      </li>
      <li>
        <a
          href="https://chat.vuejs.org"
          target="_blank"
        >
          Community Chat
        </a>
      </li>
      <li>
        <a
          href="https://twitter.com/vuejs"
          target="_blank"
        >
          Twitter
        </a>
      </li>
      <br>
      <li>
        <a
          href="http://vuejs-templates.github.io/webpack/"
          target="_blank"
        >
          Docs for This Template
        </a>
      </li>
    </ul>
    <h2>Ecosystem</h2>
    <ul>
      <li>
        <a
          href="http://router.vuejs.org/"
          target="_blank"
        >
          vue-router
        </a>
      </li>
      <li>
        <a
          href="http://vuex.vuejs.org/"
          target="_blank"
        >
          vuex
        </a>
      </li>
      <li>
        <a
          href="http://vue-loader.vuejs.org/"
          target="_blank"
        >
          vue-loader
        </a>
      </li>
      <li>
        <a
          href="https://github.com/vuejs/awesome-vue"
          target="_blank"
        >
          awesome-vue
        </a>
      </li>
    </ul>
  </div>
</template>

<script>
export default {
  name: 'HelloWorld',
  data () {
    return {
      msg: 'Welcome to Your Vue.js App'
    }
  }
}
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
h1, h2 {
  font-weight: normal;
}
ul {
  list-style-type: none;
  padding: 0;
}
li {
  display: inline-block;
  margin: 0 10px;
}
a {
  color: #42b983;
}
</style>

気を取り直してkeep going

Vue.js 4

ElementUIとは
=>Vue.jsのコンポーネントライブラリ
Vue CLIを使う？
=>インタラクティブなプロジェクトの作成

$ sudo npm install -g vue-cli
$ vue –version
2.9.6

vue init template project-name　でプロジェクトを作成する

$ vue init webpack test

? Project name test
? Project description A Vue.js project
? Author
? Vue build standalone
? Install vue-router? Yes
? Use ESLint to lint your code? No
? Set up unit tests No
? Setup e2e tests with Nightwatch? No
? Should we run `npm install` for you after the project has been created? (recom
mended) npm

vue-cli · Generated “test”.

$ npm run dev
Your application is running here: http://localhost:8080

なに？表示されない？
/config/index.jsのhostを編集

host: '192.168.34.10', // can be overwritten by process.env.HOST
    port: 8080, // can be overwritten by process.env.PORT, if port is in use, a free one will be determined
    autoOpenBrowser: false,
    errorOverlay: true,
    notifyOnErrors: true,
    poll: false,

ほう

Vue.js 3

(function(){
	'use strict';

	var likeComponent = Vue.extend({
		template : '<button>like</button>'
	});

	var app = new Vue({
		el: '#app',
		components: {
			'like-component': likeComponent
		}
	});
})();

(function(){
	'use strict';

	var likeComponent = Vue.extend({
		data: function(){
			return {
				count: 0
			}
		},
		template : '<button @click="countUp">like {{ count }}</button>',
		methods: {
			countUp: function(){
				this.count++;
			}
		}
	});

	var app = new Vue({
		el: '#app',
		components: {
			'like-component': likeComponent
		}
	});
})();

(function(){
	'use strict';

	var likeComponent = Vue.extend({
		props: {
			message: {
				type: String,
				default: 'Like'
			}
		},
		data: function(){
			return {
				count: 0
			}
		},
		template : '<button @click="countUp">{{ message }} {{ count }}</button>',
		methods: {
			countUp: function(){
				this.count++;
			}
		}
	});

	var app = new Vue({
		el: '#app',
		components: {
			'like-component': likeComponent
		}
	});
})();

(function(){
	'use strict';

	var likeComponent = Vue.extend({
		props: {
			message: {
				type: String,
				default: 'Like'
			}
		},
		data: function(){
			return {
				count: 0
			}
		},
		template : '<button @click="countUp">{{ message }} {{ count }}</button>',
		methods: {
			countUp: function(){
				this.count++;
				this.$emit('increment');
			}
		}
	});

	var app = new Vue({
		el: '#app',
		components: {
			'like-component': likeComponent
		},
		data: {
			total: 0
		},
		methods: {
			incrementTotal: function(){
				this.total++;
			}
		}
	});
})();

Vue.js 2

<p>Hello {{ name.toUpperCase() }}</p>
		<p><input type="text" v-model="name"></p>

(function(){
	'use strict';

	var vm = new Vue({
		el: '#app',
		data: {
			newItem: '',
			todos:[
				'task1',
				'task2',
				'task3'
			]

		},
		methods: {
			addItem: function(){
				// e.preventDefault();
				this.todos.push(this.newItem);
				this.newItem = '';
			}
		}
	});
})();

<div id="app" class="container">
		<h1>My Todos</h1>
		<ul>
			<li v-for="(todo, index) in todos">
			{{ todo }}
			<span @click="deleteItem(index)" class="command">[x]</span>
		</li>
		</ul>
		<form @submit.prevent="addItem">
			<input type="text" v-model="newItem">
			<input type="submit" value="Add">
		</form>
	</div>

(function(){
	'use strict';

	var vm = new Vue({
		el: '#app',
		data: {
			newItem: '',
			todos:[{
				title: 'task1',
				isDone: false
			},{
				title: 'task2',
				isDone: false
			},{
				title: 'task3',
				isDone: true
			}]

		},
		methods: {
			addItem: function(){
				var item = {
					title: this.newItem,
					isDone: false
				};
				this.todos.push(item);
				this.newItem = '';
			},
			deleteItem: function(index){
				// e.preventDefault();
				if(confirm('are you shure')){
					this.todos.splice(index, 1);
				}
				
			}
		}

	});
})();

computed: {
			remaining: function(){
				var items = this.todos.filter(function(todo){
					return !todo.isDone;
				});
				return items.length;
			}
		}

(function(){
	'use strict';

	var vm = new Vue({
		el: '#app',
		data: {
			newItem: '',
			todos:[]
		},
		watch: {
			todos: {
				handler: function(){
					localStorage.setItem('todos', JSON.stringify(this.todos));
				},
				deep: true
			}
		},
		mounted: function(){
			this.todos = JSON.parse(localStorage.getItem('todos')) || [];
		},
		methods: {
			addItem: function(){
				var item = {
					title: this.newItem,
					isDone: false
				};
				this.todos.push(item);
				this.newItem = '';
			},
			deleteItem: function(index){
				// e.preventDefault();
				if(confirm('are you shure')){
					this.todos.splice(index, 1);
				}
				
			},
			purge: function(){
				if(!confirm('delete finished')){
					return;
				}
				this.todos = this.remaining;
				
			}
		},
		computed: {
			remaining: function(){
				return this.todos.filter(function(todo){
					return !todo.isDone;
				});
			}
		}

	});
})();