<form name=‘form1‘ id=‘form1‘ action=‘/xbcw/cw/xx_xx.action‘ method=‘post‘>

　　<input type="button" id="btnSubmit" name="btnSubmit" value="保存" onclick="addKp()" class="Button2" />

　　<input type="button" id="btnSubmit" name="btnSubmit" value="下一步" onclick="doAddCwKpSubmit()" class="Button2" />

</form>

　　<iframe id="rfFrame" name="rfFrame" src="about:blank" style="display:none;"></iframe> 

　　JS:document.forms[0].target="rfFrame";

JQuery:$("#f2").attr("target","rfFrame");