自己的做法：tabpage 是div element
var objChild = [] ;
var objs = tabpage.getElementsByTagName('*');
for( var i = 0, j = objs.length; i < j; ++i ) {
if ( objs[i].nodeType != 1) { alert(objs[i].nodeType);
continue;
}
var temp = objs[i].parentNode;
if ( temp.nodeType == 1 ) {
if ( temp == tabpage ) {
objChild[objChild.length] = objs[i] ;
}
} else if ( temp.parentNode == tabpage ) {
objChild[objChild.length] = objs[i] ;
}
}