çoklu input Kopyalama

<script>
function copyToClipboard(element) {
    if(element == 1)
    var textBox = document.getElementById("myvalue");
 else
var textBox = document.getElementById("demo");
    textBox.select();
    document.execCommand("copy");
}
</script>    
 
<input type="text" class="form-control" name="myvalue"  id="myvalue" value="Merhaba Dünya!" readonly  />
 <button class="btn btn-primary btn-block" onclick="copyToClipboard(1)">Copy myvalue</button>


<input type="text" class="form-control" name="demo"  id="demo" value="Merhaba Evren!" readonly  />
 <button class="btn btn-primary btn-block" onclick="copyToClipboard(2)">Copy demo</button>