使用js提交表单form

<code class="language-html"><form action="feedback.php" method="post">
 Name:<input type="text" name="username" size="30">
 <br><br>
 Email:<input type="text" name="useraddr" size="30">
 <br><br>
 <textarea name="comments" cols="30" rows="5">
 </textarea><br>
 <input type="button" value="Send Form">
</form></code>

<code class="language-javascript">document.getElementById("formid").submit();</code>

<code class="language-html"><script>
function formSubmit()
{
     document.getElementById("form1").submit();
} 
</script>
<form action="feedback.php" method="post" id="form1">
 Name:<input type="text" name="username" size="30">
 <br><br>
 Email:<input type="text" name="useraddr" size="30">
 <br><br>
 <textarea name="comments" cols="30" rows="5">
 </textarea><br>
 <input type="button" onclick="formSubmit();" value="Send Form">
</form></code>