vue router-link上遍历 绑定的事件会自动执行是怎么回事？

<template>

    <!-- Page Sidebar -->
    <div class="page-sidebar" id="sidebar">
        <!-- Page Sidebar Header-->
        <div class="sidebar-header-wrapper">
            <input type="text" class="searchinput"/>
            <i class="searchicon fa fa-search"></i>

            <div class="searchhelper">搜索菜单</div>
        </div>
        <!-- /Page Sidebar Header -->
        <!-- Sidebar Menu -->
        <ul class="nav sidebar-menu">


            <router-link tag="li" v-for="menu in menus" :to="{ path: menu.text }">
                <a :class="{ 'menu-dropdown':menu.children }" :click="setPageHeaderText(menu.ext.display_name)">
                    <i class="menu-icon " :class=" menu.ext.icon "></i>
                    <span class="menu-text"> { menu.ext.display_name } </span>
                    <i class="menu-expand" v-if="menu.children"></i>
                </a>

                <ul class="submenu" v-if="menu.children">
                    <router-link tag="li" v-for="submenu in menu.children" :class="'second'"
                                 :to="{ path: submenu.ext.name }"
                                 active-class="active">
                        <a :click="setPageHeaderText(submenu.ext.display_name)">
                            <span class="menu-text">{ submenu.ext.display_name }</span>
                        </a>
                    </router-link>
                </ul>
            </router-link>

        </ul>
        <!-- /Sidebar Menu -->
    </div>
    <!-- /Page Sidebar -->

</template>
<style scoped>

</style>
<script>

    export default{
        name:'page-sidebar',
        data(){
            return{
                menus:[]
            }
        },

        methods: {
            setPageHeaderText(text){
            alert(text);
                //this.$store.dispatch('getPageHeaderText',text)
            }
        },
        mounted(){

            this.axios.get('menu').then(response => {
                const data = response.data.data

                if(data){
                for(var i=0;i<data.length;i++)
                   
                    if(data[i].children != null){
                        data[i].text='#'
                    }
                }
                this.menus = response.data.data
                setTimeout(InitiateSideMenu,1000)
               
            })
        }
    }

</script>

为什么我在v-for 的标签绑定事件 事件会自动执行 在遍历时我写的alert()会一直弹出我菜单里的不同的值 我的用意实际是 我在点这个菜单时 动态的更改 面包屑的值但一刷新页面就自动执行了