一、v-bind 缩写

<!-- 完全语法 -->
<a v-bind:href="url"></a>

<!-- 缩写 -->
<a :href="url"></a>

<!-- 完全语法 -->
<button v-bind:disabled="someDynamicCondition">Button</button>

<!-- 缩写 -->
<button :disabled="someDynamicCondition">Button</button>

二、v-on 缩写

<!-- 完全语法 -->
<a v-on:click="doSomething"></a>

<!-- 缩写 -->
<a @click="doSomething"></a>

三、过滤器

{{ message | capitalize }}

四、前提衬着

v-if

<h1 v-if="ok">Yes</h1>
<h1 v-else>No</h1>


<div v-if="Math.random() > 0.5">
  Sorry
</div>
<div v-else>
  Not sorry
</div>

template-v-if

<template v-if="ok">
  <h1>Title</h1>
  <p>Paragraph 1</p>
  <p>Paragraph 2</p>
</template>

v-show

<h1 v-show="ok">Hello!</h1>

五、列表衬着 for

v-for

<ul id="example-1">
  <li v-for="item in items">
    {{ item.message }}
  </li>
</ul>
var example1 = new Vue({
  el: '#example-1',
  data: {
    items: [
      { message: 'Foo' },
      { message: 'Bar' }
    ]
  }
});
    

<ul id="example-2">
  <li v-for="item in items">
    {{ parentMessage }} - {{ $index }} - {{ item.message }}
  </li>
</ul>
var example2 = new Vue({
  el: '#example-2',
  data: {
    parentMessage: 'Parent',
    items: [
      { message: 'Foo' },
      { message: 'Bar' }
    ]
  }
});

数组更改检测

Vue.js 包装了被视察数组的变异要领，故它们能触发视图更新。被包装的要领有：push(), pop(), shift(), unshift(), splice(), sort(), reverse()

example1.items.push({ message: 'Baz' });
example1.items = example1.items.filter(function (item) {
  return item.message.match(/Foo/);
});  

template-v-for

<ul>
  <template v-for="item in items">
    <li>{{ item.msg }}</li>
    <li class="divider"></li>
  </template>
</ul> 

对象 v-for

<ul id="repeat-object" class="demo">
  <li v-for="value in object">
    {{ $key }} : {{ value }}
  </li>
</ul>
new Vue({
  el: '#repeat-object',
  data: {
    object: {
      FirstName: 'John',
      LastName: 'Doe',
      Age: 30
    }
  }
}); 

值域 v-for

<div>
  <span v-for="n in 10">{{ n }} </span>
</div>

六、要领与事宜处理器

要领处理器

<div id="example">
  <button v-on:click="greet">Greet</button>
</div>

var vm = new Vue({
  el: '#example',
  data: {
    name: 'Vue.js'
  },
  // 在 `methods` 对象中定义要领
  methods: {
    greet: function (event) {
      // 要领内 `this` 指向 vm
      alert('Hello ' + this.name + '!')
      // `event` 是原生 DOM 事宜
      alert(event.target.tagName)
    }
  }
})

// 也能够在 JavaScript 代码中挪用要领
vm.greet(); // -> 'Hello Vue.js!'

内联语句处理器

<div id="example-2">
  <button v-on:click="say('hi')">Say Hi</button>
  <button v-on:click="say('what')">Say What</button>
</div>
new Vue({
  el: '#example-2',
  methods: {
    say: function (msg) {
      alert(msg)
    }
  }
});

偶然也须要在内联语句处理器中接见原生 DOM 事宜。能够用特别变量 $event 把它传入要领

<button v-on:click="say('hello!', $event)">Submit</button>
 methods: {
  say: function (msg, event) {
    // 如今我们能够接见原生事宜对象
    event.preventDefault()
  }
};

## 事宜修饰符

<!-- 阻挠单击事宜冒泡 -->
<a v-on:click.stop="doThis"></a>

<!-- 提交事宜不再重载页面 -->
<form v-on:submit.prevent="onSubmit"></form>

<!-- 修饰符能够串连 -->
<a v-on:click.stop.prevent="doThat">

<!-- 只要修饰符 -->
<form v-on:submit.prevent></form>

## 按键修饰符

<!-- 只要在 keyCode 是 13 时挪用 vm.submit() -->
<input v-on:keyup.13="submit">
<!-- 同上 -->
<input v-on:keyup.enter="submit">
<!-- 缩写语法 -->
<input @keyup.enter="submit">

悉数的按键别号：enter，tab，delete，esc，space，up，down，left，right

## 其他实例

new Vue({
  el: '#demo',
  data: {
    newLabel: '',
    stats: stats
  },
  methods: {
    add: function (e) {
      e.preventDefault()
      if (!this.newLabel) {
        return;
      }
      this.stats.push({
        label: this.newLabel,
        value: 100
      });
      this.newLabel = '';
    },
    remove: function (stat) {
      if (this.stats.length > 3) {
        this.stats.$remove(stat); // 注重这里的$remove
      } else {
        alert('Can\'t delete more!')
      }
    }
  }
});

七、过渡

CSS 过渡

<div v-if="show" transition="expand">hello</div>

然后为 .expand-transition, .expand-enter 和 .expand-leave 增加 CSS 划定规矩:

/* 必须 */
.expand-transition {
  transition: all .3s ease;
  height: 30px;
  padding: 10px;
  background-color: #eee;
  overflow: hidden;
}

/* .expand-enter 定义进入的最先状况 */
/* .expand-leave 定义脱离的完毕状况 */
.expand-enter, .expand-leave {
  height: 0;
  padding: 0 10px;
  opacity: 0;
}

你能够在统一元素上经由过程动态绑定完成差别的过渡：

<div v-if="show" :transition="transitionName">hello</div> 
new Vue({
  el: '...',
  data: {
    show: false,
    transitionName: 'fade'
  }
}

别的，能够供应 JavaScript 钩子:

Vue.transition('expand', {

  beforeEnter: function (el) {
    el.textContent = 'beforeEnter'
  },
  enter: function (el) {
    el.textContent = 'enter'
  },
  afterEnter: function (el) {
    el.textContent = 'afterEnter'
  },
  enterCancelled: function (el) {
    // handle cancellation
  },

  beforeLeave: function (el) {
    el.textContent = 'beforeLeave'
  },
  leave: function (el) {
    el.textContent = 'leave'
  },
  afterLeave: function (el) {
    el.textContent = 'afterLeave'
  },
  leaveCancelled: function (el) {
    // handle cancellation
  }
});