var list1 = [1,3,4]; 
alert(list1[1]); 
var list2 = [{"name":"leamiko","xing":"lin"}]; 
alert(list2[0]["xing"]) 
alert(list2[0].xing) 

var value = { 
  "china":{ 
    "hangzhou":{"item":"1"}, 
    "shanghai":{"item":"2"}, 
    "chengdu":{"item":"3"} 
  }, 
  "America":{ 
    "aa":{"item":"1"}, 
    "bb":{"item":"2"}  
  }, 
  "Spain":{ 
    "dd":{"item":"1"}, 
    "ee":{"item":"2"}, 
    "ff":{"item":"3"}  
  } 
}; 
  
for(var countryObj in value) 
{ 
  document.write(countryObj + ":<br />") 
  //没用的for(var cityObj in value.countryObj) 
  for(var cityObj in value[countryObj]) 
  { 
    document.write('  ' + cityObj + "<br />"); 
    for(var itemObj in value[countryObj][cityObj]) 
    { 
      document.write("   "+ itemObj + value[countryObj][cityObj][itemObj] +"<br />")  
    } 
  }  
}

var value2 = { 
  "china":[ 
    {"name":"hangzhou", "item":"1"}, 
    {"name":"shanghai", "item":"2"}, 
    {"name":"sichuan", "item":"3"} 
  ], 
  "America":[ 
    {"name":"aa", "item":"12"}, 
    {"name":"bb", "item":"2"} 
  ], 
  "Spain":[ 
    {"name":"cc", "item":"1"}, 
    {"name":"dd", "item":"23"}, 
    {"name":"ee", "item":"3"} 
  ] 
};<BR>  
for (var countryObj in value2) 
{ 
  document.write(countryObj + ":<br />")  
  for (var cityObj in value2[countryObj]) 
  { 
    //可以用document.write(" " + value2[countryObj][cityObj].item + "<br />"); 
    document.write(cityObj + " " + value2[countryObj][cityObj]["name"] + "<br />" );  
  } 
}

var value2 = { 
  "china":[ 
    {"name":"hangzhou", "item":"1"}, 
    {"name":"shanghai", "item":"2"}, 
    {"name":"sichuan", "item":"3"} 
  ], 
 
  "America":[ 
    {"name":"aa", "item":"12"}, 
    {"name":"bb", "item":"2"} 
  ], 
  "Spain":[ 
    {"name":"cc", "item":"1"}, 
    {"name":"dd", "item":"23"}, 
    {"name":"ee", "item":"3"} 
  ] 
}; 
   
  for (var countryObj in value2) 
  { 
    document.write(countryObj + ":<br />")  
    //document.write(" " + value2[countryObj].length); 
    for (var i = 0;i < value2[countryObj].length; i++) 
    { 
      document.write(" " + value2[countryObj][i]["name"] + "<br />");  
    } 
  }