var s ='<div><img style="width:450px;height:62px;" id="img_1" alt="" src="http://p.ananas.chaoxing.com/star3/270_169c/53c8d26ba310a822ad8b3447.jpg" />dfddddddd<img  id="img_2" alt="sdfdsfs" src="http://p.ananas.chaoxing.com/star2/270_169c/53c8d26ba310a822ad8b3447.jpg" />dfddddddd</div>';想要替換成這樣的形式var s ='<div>${img_1}dfddddddd${img_2}dfddddddd</div>'; 這個怎么寫呢。