console 命令行工具 X clear

console

var header_a = Vue.extend({
    template:`<p>{{message}}-{{a}}</p>`,
    data:function(){
        return {
            message:"Hello Vue!"
        }
    },
    props:['a']
});
new header_a({propsData:{a:1}}).$mount('header');

<script src="https://unpkg.com/vue"></script>
<h1>propsData Option</h1>
<hr />
<header>
    
</header>

*:not(button){
    color:#fff;
}
a:visited{
    color:lightblue
}