javascript - 列表排列

Question

我正在尝试列出所有三个字母的排列，这是我的代码 -

  window.permute = function(){
    var alphabet = "abcdefghijklmnopqrstuvwxyz";
    var searchTerm ="aaa";
    var position = 2; 
    changeString(searchTerm, position); 
}

window.changeString = function(searchTerm, position){
    if (position <0){
        alert(newString);

    return; 
    }
    var alphabet = "abcdefghijklmnopqrstuvwxyz"
    for (j=0; j < 26;j++){
        var newString = searchTerm.substr(0, position) + alphabet[j] + searchTerm.substr(position+1);
        var newPosition = position -1; 
        changeString(newString,newPosition);
    }
    return;
}

它不起作用，我不确定为什么 - 谁能帮忙？

Answer 1

var permutate = (function() {
    var results = [];    
    function doPermute(input, output, used, size, level) {        
        if (size == level) {
            var word = output.join('');
            results.push(word);
            return;
        } 
        level++;
        for (var i = 0; i < input.length; i++) {
            if (used[i]) {
                continue;
            }            
            used[i] = true;
            output.push(input[i]);
            doPermute(input, output, used, size, level);
            used[i] = false;
            output.pop();
        }
    }

    return {
        getPermutations: function(input, size) {
            var chars = input.split('');
            var output = [];
            var used = new Array(chars.length);      
            doPermute(chars, output, used, size, 0);        
            return results;    
        }
    }
})();

欲了解更多信息，请访问 http://jinwolf.tumblr.com/post/26476479113/draw-something-cheat 有关工作示例，请查看此 jsfiddle http://jsfiddle.net/jinwolf/Ek4N5/31/