function draw(n) {
        count = n * (n + 1) / 2;
        m = Math.ceil(Math.sqrt(count));
        var a = [],b = [];
        for (i = 0; i < m; i++) {
            a[i] = [];
            for (j = 0; j < m; j++) {
                a[i][j] = " ";
             }
         };
         for (i = 0; i < n; i++) {
             for (j = 0; j < i + 1; j++) {
                 b.push(i+1);
             }
         };
         //判断第一个
         t = Math.ceil(m / 2);
         x = t-1;
         y = t - 1;
         if (m % 2 == 0) {
             y = t;
         };
         x1 = x;
         y1 = y;
         //开始画
         to = 1; //向下 2左 3上 4右
         for (i = 0; i < count; i++) {
             try {
                 a[x][y] = b[i] ;
             } catch (e) {

             };
             n = Math.ceil(Math.sqrt(i + 1+1));
             if (n % 2 == 0) {
                 n1 = n / 2+1;
                 n2 = n / 2+1;
             } else {
                 n1 = Math.ceil(n / 2) - 1;
                 n2 = Math.ceil(n / 2)
             }

             if (to == 1) {//向下
                 if (Math.abs(x + 1 - x1) < n2) {
                     x = x + 1;
                 } else {//向左
                     y = y - 1;
                     to = 2;
                 }
             } else if (to == 2) {//向左
                 if (Math.abs(y1 - (y - 1)) < n2 && (y-1) >=0) {
                     y = y - 1;
                 } else {//向上
                     x = x - 1;
                     to = 3;
                 }
             } else if (to == 3) {//向上
             if (Math.abs(x1 - (x - 1)) <= n1 && (x-1) >= 0 ) {
                     x = x - 1;
                 } else {//向右
                     y = y + 1;
                     to = 4;
                 }
             } else if (to == 4) {//向右
             if (Math.abs(y + 1 - y1) <= n1) {
                     y = y + 1;
                 } else {//向下
                     x = x + 1;
                     to = 1;
                 }
             }
         }

         var s = "";
         for (i = 0; i < m; i++) {
             s += a[i].join(" ");
             s += "\n";
         };
        return s;
    }
    console.log(draw(9));