js_javascriptスキルでオブジェクトオブジェクトを出力する方法

function writeObj(obj){ 
 var description = ""; 
 for(var i in obj){ 
  var property=obj[i]; 
  description+=i+" = "+property+"\n"; 
 } 
 alert(description); 
} 

function obj2string(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+":"+obj2string(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(obj2string(o[i])) 
   } 
   r="["+r.join()+"]"; 
  } 
  return r; 
 } 
 return o.toString(); 
}