jsfm.js
function simpleExtend( from, to ) {
		for ( var k in from) {
			if (to[k] == undefined) {
				to[k] = from[k];
			}
		}
		return to;
	}
function simpleExtend( from, to ) {
		for ( var k in from) {
			if (to[k] == undefined) {
				to[k] = from[k];
			}
		}
		return to;
	}
function simpleExtend ( from , to ) { for ( var k in from ) { if ( to [ k ] == undefined ) { to [ k ] = from [ k ] ; } } return to ; }
Extend to one level.
Extend to one level .