这东西，低版本浏览器没有。所以：

  var JS = function(){      //bravf_Zh      //bravfing@126.com      //2011.8.19            var _toStr = function(obj){          var type = Object.prototype.toString.call(obj).slice(8,-1) , rs;                    //如果是html节点(不完全判断,可伪造)          if(obj.nodeType!=null){              return "HTMLNODE"          }                    switch(type){              case "Undefined" : rs = undefined; break;              case "Null" : rs = null; break;              case "String" : rs = '"' + obj + '"'; break;                            case "Number" :                case "Boolean" :               case "Date" :               case "RegExp" :  rs = obj ; break;                            case "Array" :                  rs = "";                  for(var i=0,len=obj.length;i<len;i++){                      rs+=_toStr(obj[i])+",";                  }                  rs = "[" + rs.slice(0,-1) + "]";                  break;                            case "Object" :                  rs = [];                      for(var k in obj){                      rs.push('"' + k.toString() + '":' + _toStr(obj[k]));                  }                  rs = "{" + rs.join(",") + "}";                  //rs = _toStr(obj);                  break;          }          return rs;      };            return {"toStr":_toStr};  }();      o = [{"x":1,y:2,z:[3,4],w:[3,{x:[1]}],q:{x:[5,6]}},"hello",1.2];  document.write("JSON.stringify: <br/>" + JSON.stringify(o));  document.write("<br/>");  document.write("JS.toStr:<br/>" + JS.toStr(o));

　　用来在ie中调试，非常方便。