javascript Object转换String (json str)

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();
}