function obj2str(o){

var r = [];

if(typeof o =="string") return "\""+o.replace(/([\'\"\\])/g,"\\$1").replace(/(\n)/g,"\\n").replace(/(\r)/g,"\\r").replace(/(\t)/g,"\\t")+"\"";

    if(typeof o == "object"){

        if(!o.sort){

            for(var i in o)

                r.push(i+":"+obj2str(o[i]));

            if(!!document.all && !/^\n?function\s*toString\(\)\s*\{\n?\s*\[native code\]\n?\s*\}\n?\s*$/.test(o.toString)){

                r.push("toString:"+o.toString.toString());

            }

            r="{"+r.join()+"}"

        }else{

            for(var i =0;i<o.length;i++)

                r.push(obj2str(o[i]))

            r="["+r.join()+"]"

        }

        return r;

    }

    return o.toString();

}

转载:http://www.drupaleye.com/node/27