<iframe id="qrcode-iframe" name="submitIframe" src="about:blank" width="100%" height="750px" frameborder="no" border="0" marginwidth="0" marginheight="0" >
</iframe>
<script>
$(function() {
var form = "<form id="alipaysubmit" name="alipaysubmit" action="https://mapi.alipay.com/gateway.do?_input_charset=utf-8" method="get" target="submitIfram"></form><script>document.forms['alipaysubmit'].submit();</script>";
$("#qrcode-iframe").append($(form));
});
</script>
指定表单的target为iframe的name即可
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