Getting syntax error using &&

• XData block (MimeType) The default is text/xml
• Encoding Translation

Try this:

XData Script
{
<script type="text/javascript">
var v1=1;
var v2=2;
function Colors() {
  if (v1=1&amp;&amp;v2=2) {
    alert('&amp;&lt;&gt;&quot;');
  }
}
</script>
}