vue从入门到进阶：自定义指令directive，插件的…

// 注册一个全局自定义指令 `v-focus`
Vue.directive('focus', {
  // 当被绑定的元素插入到 DOM 中时……
  inserted: function (el) {
    // 聚焦元素
    el.focus()
  }
})

directives: {
  focus: {
    // 指令的定义
    inserted: function (el) {
      el.focus()
    }
  }
}

<input v-focus>

<div id="hook-arguments-example" v-demo:foo.a.b="message"></div>

Vue.directive('demo', {
  bind: function (el, binding, vnode) {
    var s = JSON.stringify
    el.innerHTML =
      'name: '       + s(binding.name) + '<br>' +
      'value: '      + s(binding.value) + '<br>' +
      'expression: ' + s(binding.expression) + '<br>' +
      'argument: '   + s(binding.arg) + '<br>' +
      'modifiers: '  + s(binding.modifiers) + '<br>' +
      'vnode keys: ' + Object.keys(vnode).join(', ')
  }
})

new Vue({
  el: '#hook-arguments-example',
  data: {
    message: 'hello!'
  }
})

name: "demo"
value: "hello!"
expression: "message"
argument: "foo"
modifiers: {"a":true,"b":true}
vnode keys: tag, data, children, text, elm, ns, context, fnContext, fnOptions, fnScopeId, key, componentOptions, componentInstance, parent, raw, isStatic, isRootInsert, isComment, isCloned, isOnce, asyncFactory, asyncMeta, isAsyncPlaceholder

Vue.directive('color-swatch', function (el, binding) {
  el.style.backgroundColor = binding.value
})

<div v-demo="{ color: 'white', text: 'hello!' }"></div>

Vue.directive('demo', function (el, binding) {
  console.log(binding.value.color) // => "white"
  console.log(binding.value.text)  // => "hello!"
})

MyPlugin.install = function (Vue, options) {
  // 1. 添加全局方法或属性
  Vue.myGlobalMethod = function () {
    // 逻辑...
  }

  // 2. 添加全局资源
  Vue.directive('my-directive', {
    bind (el, binding, vnode, oldVnode) {
      // 逻辑...
    }
    ...
  })

  // 3. 注入组件
  Vue.mixin({
    created: function () {
      // 逻辑...
    }
    ...
  })

  // 4. 添加实例方法
  Vue.prototype.$myMethod = function (methodOptions) {
    // 逻辑...
  }
}

// 调用 `MyPlugin.install(Vue)`
Vue.use(MyPlugin)

Vue.use(MyPlugin, { someOption: true })

// 用 Browserify 或 webpack 提供的 CommonJS 模块环境时
var Vue = require('vue')
var VueRouter = require('vue-router')

// 不要忘了调用此方法
Vue.use(VueRouter)

<template>
    <div>封装一个最简单的插件</div>
</template>
<script>
export default{
    name:'count-down'
}
</script>

import countDown from './countdown';

countDown.install = function(Vue){
    Vue.component(countDown.name,countDown)
};

export default countDown;

import countDown from './components/countdown/index.js' 
Vue.use(countDown)

<count-down></count-down>

// 定义一个混合对象
var myMixin = {
  created: function () {
    this.hello()
  },
  methods: {
    hello: function () {
      console.log('hello from mixin!')
    }
  }
}

// 定义一个使用混合对象的组件
var Component = Vue.extend({
  mixins: [myMixin]
})

var component = new Component() // => "hello from mixin!"

var mixin = {
  created: function () {
    console.log('混合对象的钩子被调用')
  }
}

new Vue({
  mixins: [mixin],
  created: function () {
    console.log('组件钩子被调用')
  }
})

// => "混合对象的钩子被调用"
// => "组件钩子被调用"

var mixin = {
  methods: {
    foo: function () {
      console.log('foo')
    },
    conflicting: function () {
      console.log('from mixin')
    }
  }
}

var vm = new Vue({
  mixins: [mixin],
  methods: {
    bar: function () {
      console.log('bar')
    },
    conflicting: function () {
      console.log('from self')
    }
  }
})

vm.foo() // => "foo"
vm.bar() // => "bar"
vm.conflicting() // => "from self"

// 为自定义的选项 'myOption' 注入一个处理器。
Vue.mixin({
  created: function () {
    var myOption = this.$options.myOption
    if (myOption) {
      console.log(myOption)
    }
  }
})

new Vue({
  myOption: 'hello!'
})
// => "hello!"

Vue.config.optionMergeStrategies.myOption = function (toVal, fromVal) {
  // return mergedVal
}

var strategies = Vue.config.optionMergeStrategies
strategies.myOption = strategies.methods