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回傳函式應用 (closure)
by 蘇德宙, 2012-06-06 15:42, 人氣(1456)
var setup = function() {
  var count = 0;  // closure, provide private used internal only
    return function() {
      return count ++;
    }
}

var next = setup();
next();  // 1
next();  // 2