根据字符串、字符串数组创建map

makeMap.js

/**
 * 根据字符串、字符串数组创建map
 * @param {String|Array<String>} items
 * @param {String|RegExp} delimiter 默认值/\s+/
 * @param {Object} [map]
 * @returns {{*}}
 */
var makeMap = function (items, delimiter, map) {
    items = items || [];
    if (typeof items === 'string') {
        items = items.split(delimiter || /\s+/);
    }
    map = map || {};

    for (var i = items.length - 1; i >= 0; i--) {
        map[items[i]] = true;
    }
    return map;
}