HTML Template

<div id="view"></div>

<script type="text/template" id="demo">
    <p>Hi, I'm <%=author%></p>
    <p>I can write:
    <% 
        for(var i=0; i<languages.length; i++) { 
            echo( (i===0?"":", ") + languages[i] );
        }
    %>
    </p>
</script>

Javascript

document.getElementById('view').innerHTML = tpl('#demo', {author: "Jony", languages: ["javascript", "php", "shell"]});

Result