<input type="text" name="" id="input" class="form-control" value="" required="required" pattern="" title="" v-model='keywords'
v-focus>
Vue.directive('focus',{
bind:function(el){
el.focus()
},
updated:function(el){
el.focus()
},
inserted:function(el){
el.focus() DOM元素創建完成后
},
})