Vue.js popover 传参使用

<a v-if="model.code" v-popoverexpress :content="content" :code="model.code"
   style='padding: 2px; background-color: #ffffff; text-align: left;'
   data-container='body' data-toggle='popover' data-placement='right'>
    {{model.code}}
</a>

Vue.directive('popoverexpress', {
    params: ['code'],
    bind: function bind() {
        console.log(this.params.code);
        $(this.el).popover(
            {
                trigger: 'hover',
                container: 'body',
                html: true,
                placement: 'right',
                content: getExpressInfo(this.params.code)
            });
    },
    unbind: function unbind() {
        $(this.el).popover('destroy');
    }
});