jsp child page pass value to parent page

============父=========

var zt = '${param.zt}';
var ay = '${param.ay}';

============子===============
parent.zt="撤销";


if($('#editForm1').form('validate')){
$('#editForm1').form('submit',{
//alert(($('input[name=id]',$('#editForm1')).val()));
url:($('input[name=id]',$('#editForm1')).val())?'emsyqkAction!updatezc.ces?tt='+getRandomId():'emsyqkAction!add.ces?tt='+getRandomId(),
//url:($('#id').val())?'emJbxxAction!update.ces?tt='+getRandomId():'emJbxxAction!add.ces?tt='+getRandomId(),
onSubmit:function(){
//alert(999);
$('#btnSave').linkbutton('disable');
$('#btnClose').linkbutton('disable');
},
success:function(data){
//alert(000);
if(data=='success'){
$.messager.alert('Prompt','Save successfully!','info',function(){
parent.zt="Cancel";
window .location.href = "edit.jsp?emId="+id;

});
}else{
$.messager.alert('Prompt','Save failed!','error');
}
$('#btnSave' ).linkbutton('enable');
$('#btnClose').linkbutton('enable');
}
});
}