穷举一个数组中各个元素的排列
减而治之、递归
function getPermutation(arr) { if (arr.length == 1) { return [arr]; }
var permutation = []; for (var i=0; i var permutation = getPermutation(['a','b','c']); console.dir(permutation);
var permutation = getPermutation(['a','b','c']); console.dir(permutation);
