<html>
<head>
</head>
<body>
<input type="button" value="+ Input">
<table id="dp">
</table>
<script>
c=0
table=document.querySelector("#dp")
document.querySelector("input").onclick=function(){
var el=document.createElement("tr")
c++
el.innerHTML='<td><input id="qqqh'+c+'" placeholder="H'+c+'" class="input_other_add_item"></td><td> <input id="qqqx'+c+'" placeholder="X'+c+'" class="input_other_add_item"></td>'
table.appendChild(el)
}
</script>
</body>
</html>