The above answers will probably work as expected. I would still like to point out that with the template literals in ES6 you can achieve the same effect in an easier way:

const contactArray = [
 {Name:"Blake Janacek",Title:"Marketing Manager"},
 {Name:"Dominic Flanders",Title:"Project Manager"} ];
 
document.querySelector("#dataTable tbody").innerHTML=
  contactArray.map(({Name,Title})=>
   `<tr>
      <td>${Name}</td>
      <td>${Title}</td>
    </tr>`).join("\n");

<table id="dataTable" width="100%" cellspacing="0">
   <thead>
     <tr>
       <th>Name</th>
       <th>Title</th>
     </tr>
   </thead>
   <tbody>
   </tbody>
</table>

The template literal is supplied directly in the JavaScript code section.