[null, true, false, "hello\" \\ \/ \b \f\n\r\t"]   [102, 10.2, 0.2, 00, "hello\u0234\u005c \uD834\uDD1E"]
[100,001,00.00,2.00, "汉语 / 漢語; Hàn\b \tyǔ "]
[.2,.02, .00,2e-1, 02e-1]
[-102,-100,-.00, -2e1]
  {} {"key1": "value1"}
   { "key1" :"value1", "key2" :"value2"}
{"z":1,"a":1,"c":1,"d":1,"f":1,"e":1,"b":1,"x":1}
[ "hello", { "key1": [ "world", { "key2": { "key3": 20 } } ] } ]