<script>
function jsSubmit() {
 var frm = document.getElementById('frm');
 frm.submit();
}

function jquerySubmit() {
 $('#frm').submit();
}
</script>

<form id="frm" action="./formtest.htm" method="get">
Username:<input type="text" name="username" />
<br />
<input type="submit" name="submit" value="提交" />
</form>
<a href="javascript:jsSubmit()">js submit form</a>
<br /><br />
<a href="javascript:jquerySubmit()">jquery submit form</a>

<form name="objForm" method="post" action="action.do">   

  <input type="button" name="submit" onclick="do_commit()">

</form>

function do_commit(){

  document.objForm.submit();

}