父页HTML:

          <iframe  ></iframe>


父页JS:

 <script src="../Scripts/js/jquery-2.1.1.min.js"></script> 

  <script>
        function iFrameHeight() {
            var ifm = document.getElementById("mainframe");
            var subWeb = document.frames ? document.frames["mainframe"].document : ifm.contentDocument;
            if (ifm != null && subWeb != null) {
                ifm.height = document.body.offsetHeight;
                ifm.width = subWeb.body.scrollWidth;
            }
        }
    </script>

子页JS

<script src="../Scripts/js/jquery-2.1.1.min.js"></script> 

  <script>

  $(window.parent.document).find("#mainframe").load(function () {
      var ifm = window.parent.document.getElementById("mainframe");
      var subWeb = window.parent.document.frames ? window.parent.document.frames["mainframe"].document : ifm.contentDocument;
      if (ifm != null && subWeb != null) {
           ifm.height = subWeb.body.offsetHeight + 20;               //预留出灵活高度20px
          ifm.width = subWeb.body.scrollWidth;
      }
    
  });

  </script>

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