oJSONCode1 = 
  [
    {"城市":"北京","面积":16800,"人口":1600},
　  {"城市":"上海","面积":6400,"人口":1800}
  ]
 
oJSONCode2 = 
  [
  　["北京",16800,1600],
  　["上海",6400,1800]
  ]

oJSONCode3 =    
    { 
      "classA":[
        {"name":"张三","nationality":"汉族","nativeplace":"长春"},
        {"name":"李四","nationality":"回族","nativeplace":"大连"},
        {"name":"王五","nationality":"汉族","nativeplace":"哈尔滨"}
    　],
      "classB":[
        {"name":"李伟民","nationality":"汉族","nativeplace":"沈阳"},
        {"name":"张群","nationality":"汉族","nativeplace":"济南"},
        {"name":"王晓芳","nationality":"回族","nativeplace":"西宁"},
        {"name":"牟玉兰","nationality":"汉族","nativeplace":"西宁"}
    　],
      "classC":[
        {"name":"伍晓光","nationality":"汉族","nativeplace":"北京"},
        {"name":"杨帆","nationality":"汉族","nativeplace":"广州"}
    　]
    }