JavaScript小筆記

分類 :

1. Primitive types, Object types
2. Methods, Types
3. Mutable types, immutable types

Number 

1. 0, -0 (0 == -0, 1/0 != 1/-0)
2. Infinity, -Infinity
3. NaN

  Function

  function func(){

    this.x = 0;

    this.getX = function(){ return this.x; }

    this.setX = function(x){ this.x = x; }

  }

  var a = func(); //此時執行的this是javascript最頂層的global object

  var b = new func(); //此時執行的this是javascript最頂層的global object