(function() {  var map = (function() {    function map(n) {      this.map = [], this.row = 0, this.col = -1, this.dir = 0, this.n = n;      // 建立個二維數組      for (var i = 0; i < this.n; i++) { this.map.push([]); }      // 定義移動的順序為 右，下，左，上      var order = [this.right, this.bottom, this.left, this.up];      i = 0;      do {        // 能移動則更新數字，否則更改方向        order[this.dir % 4].call(this) ? i++ : this.dir++;        // 賦值        this.map[this.row][this.col] = i;      } while (i < n * n);    }    map.prototype = {      print: function() { for (var i = 0; i < this.n; i++) { console.log(this.map[i].join(' ')) } },      // 向該方向移動      left: function() { return this.move(this.row, this.col - 1); },      right: function() { return this.move(this.row, this.col + 1); },      up: function() { return this.move(this.row - 1, this.col); },      bottom: function() { return this.move(this.row + 1, this.col); },      // 如果坐標在范圍內，并且目標沒有值，條件滿足則更新坐標      move: function(row, col) {        return (0 <= row && row < this.n) && (0 <= col && col < this.n) && !this.map[row][col] && (this.row = row, this.col = col, true);      },    };    return map;  })();  new map(6).print();})();