为什么这样会弹出两个页面？

Question

<script language="Javascript">
function submitToNew(theForm, urls, targets)
{alert('k');
theForm.action = urls;
theForm.target = targets;
//theForm.submit();
}
</script>
<form name="form1" method="post">
<table width="90%" align="center">
  <tr>
    <td class="module_menu">
     <input type="submit" name="print" onClick="submitToNew(this.form, '1.html', '_blank');" value="打印">
</td>
  </tr>
</table>
</form>

Answer 1

<script language="Javascript">
function submitToNew(theForm, urls, targets)
{
theForm.action = urls;
theForm.target = targets;
//theForm.submit();
}
</script>
<form name="form1" method="post">
<table width="90%" align="center">
  <tr>
    <td class="module_menu">
     <input type="submit" name="print" onClick="submitToNew(this.form, '1.html', '_blank');" value="打印">
</td>
  </tr>
</table>
</form>

Answer 2

input type="submit" //这样子默认就submit了或者改为input type=button或者不执行submit