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<script> 
var input = 1;
function mais(campo) { 
document.getElementById("aqui").innerHTML+="input "+input+" - "+campo+" <input type='text' name='"+campo+"' value=''><br>"; 
document.form.campo.value=""; 
input++;
} 
</script> 

<form name="form" method="GET"> 
name do input <input type="text" name="campo" value=""> 
<input type="button" value="adicionar input" onClick="mais(campo.value)"> 
<div id="aqui"></div>
<input type="submit">
</form>

<script>
var input = 1;
function mais(campo) {
 
var valor = "input "+input+" - "+campo+" <input type='text' name='"+campo+"' value=''><br>";
var nova = document.getElementById("aqui");
var novadiv = document.createElement("div");
var nomediv = "div";
novadiv.innerHTML = ""+input+" <input type='text' name='"+campo+"' value=''>";
nova.appendChild(novadiv);
 
input++;
}
</script>

<form name="form" method="GET">
name do input <input type="text" name="campo" value="">
<input type="button" value="adicionar input" onClick="mais(campo.value)">
<div id="aqui"></div>
<input type="submit">
</form>

<script>
function mais(id, campo) {
var valor = "<input type='text' name='"+campo+"' value=''><br>";
var nova = document.getElementById(id);
var novadiv = document.createElement("div");
var nomediv = "div";
novadiv.innerHTML = "<input type='text' name='"+campo+"' value=''>";
nova.appendChild(novadiv);
}
</script>

<form name="form" method="GET">
name do input <input type="text" name="campo1" value="">
<input type="button" value="adicionar input" onClick="mais('aqui','campo1')">
<div id="aqui"></div>
name do input <input type="text" name="campo2" value="">
<input type="button" value="adicionar input" onClick="mais('aqui2','campo2')">
<div id="aqui2"></div>
<input type="submit">
</form>