随机打乱数组

shuffle.js

/**
 * @param {Array} list
 * @return {Array}
 */
function shuffle(list) {
    var len = list.length;
    var randomIndex, buffer;
    while (len) {
        randomIndex = Math.floor(Math.random() * len);
        buffer = list[--len];
        list[len] = list[randomIndex];
        list[randomIndex] = buffer;
    }
    return list;
}