demo3.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<div id="app">
    <h1 v-txt>1,2,3,4,5,10,12,05</h1>
    <h1 v-date>1525848888799</h1>
</div>

<script src="vue.js"></script>

<script>
    new Vue({
        el:"#app",
        directives:{
            "txt":function (el,binding) {
                console.log(el.innerText);
                var arr = el.innerText.split(",");
                console.log(arr);
                for (var i = 0; i < arr.length;i++){
                    if(arr[i].length == 1){
                        console.log("0" + arr[i]);
                        arr[i] = "0" + arr[i];
                    }
                }
                el.innerText = arr.join(",");
            },
            "date":function (el,binding) {
                var dates = new Date()
                console.log(dates.getTime());
                let str = el.innerText.replace(/\s/g,"");
                console.log(str);
                var date = new Date(parseInt(str));
                console.log(date);

            }
        }
    })
</script>
</body>
</html>