Javascript-PHP - assing a concatenated string to a variable -

i want include variable between 2 strings , assign new variable. tried

 var row="<tr><td>".$i."</td></tr>"; 

and

   var row="<tr><td>"$i"</td></tr>"; 

and

var row="<tr><td>$i</td></tr>"; 

and

var row=$("<tr><td>$i</td></tr>"); 

and

var row=$("<tr><td>"$i"</td></tr>"); 

and

var row=$("<tr><td>".$i."</td></tr>"); 

but none of previous works. there way that?

you mixing js & php.

php:

$row = "<tr><td>" . $i . "</td></tr>"; 

or

$row = "<tr><td>$i</td></tr>"; 

javascript:

var row = "<tr><td>" + + "</td></tr>";