Parent page:

document.domain = ‘xxxx.com‘

function fixIframeHeight(h,iframe){

    $(iframe).height(h);
}

Iframe page:

document.domain = ‘xxxx.com‘
console.log(‘reset header iframe height!!‘);
window.onload = function(){
  parent.fixIframeHeight(document.documentElement.scrollHeight,‘#headeriframe‘);
}
window.onresize = function(){
  parent.fixIframeHeight(document.documentElement.scrollHeight,‘#headeriframe‘);
}

iframe auto set height