通過traceur.js來編寫ES6
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title></title>
<link rel="stylesheet" href="">
<script scr= "../traceur.js"></script>
<script>
traceur.options.experimental = true;
</script>
</head>
<body>
</body>
<html>