js implements not re-refreshing the current page after form submission

How to prevent the current page from being refreshed after submitting the form

<form name=&#39;form1&#39; id=&#39;form1&#39; action=&#39;/xbcw/cw/xx_xx.action&#39; method=&#39;post&#39;>
　　<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>

When I click Save to submit the FORM form, how can I keep the current page unchanged (that is, not refresh the current page)?

Add an iframe after the FORM form

　3fd24ed8386b437cbda9015eab5173f2065276f04003e4622c4fe6b64f465b88

Click Save In the submission event, you need to change the target to the name of the iframe: JS: document.forms[0].target="rfFrame"; );

In this way, the FORM is submitted and the data is saved, and the page will not jump.