Javascript type<! –more–>

+Five basic data types

  • number， The special ones are NaN, Infinity, and Infinity. NaN (Not a Number) is actually of type Number
  • string
  • boolean
  • undefined， The only value is undefined
  • null， The only value is null
    +All others are object data types, including arrays
    +One thing to note is that all values can be converted to true (through!!)!! Except for the following six false values
  • “”
    0
  • null
  • undefined
  • NaN
  • false