用javascript实现邮件处理中的全部选择与读取选择[4]

                                                        arrobj[i].checked =true;

                                                 }

                                          }

                                   }

                                   else

                                   {

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

                                          {

                                             if(typeof arrobj[i].type != "undefined" && arrobj[i].type=='checkbox') arrobj[i].checked =false;

                                          }

                                   }

                            }