javascript - How to perform query string on the page loaded inside a div -

my case simple, loading page in div shown below. parent.html page contains loadpage() function load child page in includedcontent div element. parent.html url has parameter append it.

parent.html?data=123

<script> function loadpage() {             $("#includedcontent").load("child.html",{data1='one'});         } </script> 

as expected child page loaded inside div , performing querystring @ child page body onload event, in both location.search , window.location.href returns query of parent page data=123 expected content data1='one', how url content of child page.