Vue中的directive指令快速使用

Vue.directive(id,[definition])

// 注册
Vue.directive('my-directive',{
    bind:  function () {},         
    inserted: function () {},
    update: function () {},
    componentUpdated: function () {},
    unbind: function() {}
})

<template>
  <div class="content">
    <div id="hook-arguments-example" v-demo:foo.a.b="message"></div>
  </div>
</template>  
<script>
export default {
  name: 'Content',
  data(){
    return{
      message: 'hello!'
    }
  },
  directives: {
    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(', ')
      }
    }
  }
}
</script>

Vue.directive('focus',{
  // 当绑定元素插入到 DOM 中
  inserted: function(el) {
    el.focus();
  }
})
new Vue({
  router,
  store,
  render: h => h(App),
}).$mount('#app')

<template>
  <div class="content">
    <input type="text" v-focus/>
  </div>
</template>  

<template>
  <div class="content">
    <input type="text" v-focus/>
  </div>
</template>  
<script>
export default {
  name: 'Content',
  directives: {
    focus: {
      // 指令的定义
      inserted: function(el) {
        el.focus();
      }
    }
  }
}
</script>