// ...
computed: {fullName: {// getterget: function () {return this.firstName + ' ' + this.lastName},// setterset: function (newValue) {var names = newValue.split(' ')this.firstName = names[0]this.lastName = names[names.length - 1]}}
}
// ...

<ul v-for='item in obj'><li>{{addHandle(item)}}</li>
</ul>

methods: {addHandle(item) {return item++}
}

var vm = new Vue({el: '#demo',data: {firstName: 'Foo',lastName: 'Bar',fullName: 'Foo Bar'},watch: {firstName: function (val) {this.fullName = val + ' ' + this.lastName},lastName: function (val) {this.fullName = this.firstName + ' ' + val}}
})

var vm = new Vue({el: '#demo',data: {firstName: 'Foo',lastName: 'Bar'},computed: {fullName: function () {return this.firstName + ' ' + this.lastName}}
})

<div id="watch-example"><p>Ask a yes/no question:<input v-model="question"></p><p>{{ answer }}</p>
</div>

<!-- 因为 AJAX 库和通用工具的生态已经相当丰富，Vue 核心代码没有重复 -->
<!-- 提供这些功能以保持精简。这也可以让你自由选择自己更熟悉的工具。 -->
<script src="https://cdn.jsdelivr.net/npm/axios@0.12.0/dist/axios.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/lodash@4.13.1/lodash.min.js"></script>
<script>
var watchExampleVM = new Vue({el: '#watch-example',data: {question: '',answer: 'I cannot give you an answer until you ask a question!'},watch: {// 如果 `question` 发生改变，这个函数就会运行question: function (newQuestion) {this.answer = 'Waiting for you to stop typing...'this.getAnswer()}},methods: {// `_.debounce` 是一个通过 Lodash 限制操作频率的函数。// 在这个例子中，我们希望限制访问 yesno.wtf/api 的频率// AJAX 请求直到用户输入完毕才会发出。想要了解更多关于// `_.debounce` 函数 (及其近亲 `_.throttle`) 的知识，// 请参考：https://lodash.com/docs#debounce
    getAnswer: _.debounce(function () {if (this.question.indexOf('?') === -1) {this.answer = 'Questions usually contain a question mark. ;-)'return}this.answer = 'Thinking...'var vm = thisaxios.get('https://yesno.wtf/api').then(function (response) {vm.answer = _.capitalize(response.data.answer)}).catch(function (error) {vm.answer = 'Error! Could not reach the API. ' + error})},// 这是我们为判定用户停止输入等待的毫秒数500)}
})
</script>