我这里有一个iframe，它反映了我制作的appscript。当链接更改或用户提交表单时，如何将用户重定向到另一页？

   <div class="embed-responsive embed-responsive-1by1">
      <iframe id="main_iframe" class="embed-responsive-item" src="https://script.google.com/macros/s/AKfycbx4G-n0ZTowZENy4haaUyI3s-S5WLbAD2yUVRRpNZDBP06jKlTox_eqFEBZXxOodSeq/exec" frameborder="0"></iframe>
    </div>



<script type="text/javascript">
var load = 0;

document.getElementById('main_iframe').onload = function(){
    /*Execute on every reload on iFrame*/
    load++;
    if(load > 1){
        /*Second reload is a submit*/
        window.open("https://digitsorani.net/mulawin-pasahero-success/","_top")
    }
}
</script>

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