vue binding properties and two-way data binding

<! DOCTYPE HTML > 
< HTML lang = "EN" > 
< head > 
    < Meta charset = "UTF-. 8" > 
    < title > attribute binding and two-way data binding </ title > 
    < Script the src = "Vue.js" > </ Script > 
</ head > 
< body > 
< div ID = "the root" > 
    <! - use: or v-bind: let div attribute value pointing to data in data sources vue -> 
    <! - binding properties 1. v-bind:2 :-->
    <div :title="'deal li'+title">
        hello world
    </div>
   <!--双向绑定-->
    <input v-model  ="content"/>

    <div>{{content}}</div>
</div>
<script>
    new Vue(
        {
            el:"#root",
            data:{
                title:"this is hello world",
                content:"this is content"
            }
        }
    )
</script>
</body>
</html>