Vue 2.0 Hello World

HTML

<script src="https://unpkg.com/vue/dist/vue.js"></script>

<div id="app">
  <one @ev="log"></one>
</div>

JavaScript

Vue.component('one', {
	template: `<two @ev="$emit('ev', $event)"></two>`
})

Vue.component('two', {
	template: `<button @click="$emit('ev', 'hello from the deep')">click</button>`
})

new Vue({
  el: '#app',
  methods: {
    log: function (e) {
      console.log(e)
    },
  }
})