用JavaScript实现螺旋矩阵算法

在实际开发中需要用到螺旋矩阵算法，用JS代码实现了：

var cal = function(len){
        var helix = [[],[],[],[],[],[]];
        var min = 0;
        var max = len - 1;
        var row = 0;
        var col = 0;
        for(var i=0; i < len * len; i++) {
                helix[row][col]=i+1;
                if(row == min && col < max) {
                        col = col + 1;
                }
                else if(row < max && col == max) {
                        row = row + 1;
                }
                else if(row == max && col > min) {
                        col = col - 1;
                }
                else if(row > min && col == min) {
                        row = row - 1;
                }
                if(row - 1 == min && col == min){
                        min = min + 1;
                        max = max - 1;
                }
        }
        return helix;
};

var helix = cal(6);
var html = '';
for(var i=0; i < helix.length; i++) {
        for(var j=0; j < helix[i].length; j++) {
                html += helix[i][j] + ' ';
        }
        html += '<br />';
}
$('#container').html(html);