title: How to declare Vue data type
body: <p>I would like to assign a datatype to data variable.</p>
  
  <pre><code>var app = new Vue({
    el: '#app',
    data: {
        var1:'',
  
    },
    methods:{
  
    },
  
    delimiters: ["[[","]]"],
  });
  </code></pre>
  
  <p>How can I assign a datatype = Integer to <code>var1</code>.</p>