function extend(des, src, override){
	if(src instanceof Array){
		for(var i = 0, len = src.length; i < len; i++)
			 extend(des, src[i], override);
	}
	for( var i in src){
		if(override || !(i in des)){
			des[i] = src[i];
		}
	} 
	return des;
}
var a ={"a":"1","b":"2"}
var b ={"c":"3","d":"4","e":"5"}
var c = extend({}, [a,b]);
//在调试工具的console中查看，当然也可以用alert(c);
console.log(c);

转自：http://blog.csdn.net/zhangdaiscott/article/details/5517261