<template>
<div class="header">
  <h4 style="color:orange;">header component</h4>
</div>
</template>
<script type="module">
export default {
  methods:{
    add_number(){

    }
  },
  setup(){
    console.log("about vue component setup");
  },
  mounted(el){
    console.log("about vue under mounted ---");
  }
}
</script>
<style scoped>
.header{
  color:orange;
  font-weight: bolder;
}
</style>