URL HASH操作

/**
 * 比如：demo.com#test=1&test2=2
 * @param key
 * @return value
 */
export function getUrlHash(key: string) {
    const matches = window.location.hash.match(new RegExp(key + '=([^&]*)'));
    if (matches && matches.length) {
        return decodeURIComponent(matches[1]);
    }
    return null;
}
/**
 * 设置url hash
 * 覆盖原有hash的值并保留原有的hash值
 * 比如：#test=1&test2=2
 * @param key
 * @param value
 */
export function setUrlHash(key: string, value: string) {
    // 解析原有的hash值
    let rawHash = window.location.hash.substr(1);
    let resultHash: string[] = [];
    if (rawHash) {
        let hashArr = rawHash.split(/&/).reduce((pr, cr) => {
            return pr.concat([cr.split(/=/)]);
        }, [] as any[]);
        let hashMap = new Map(hashArr);
        hashMap.set(key, encodeURIComponent(value));
        // 还原为url hash结构
        for (let [k, v] of hashMap) {
            if (v) {
                resultHash.push(k + '=' + v);
            } else {
                resultHash.push(k + '');
            }
        }
    } else {
        resultHash.push(key + '=' + encodeURIComponent(value));
    }
    window.location.hash = resultHash.join('&').toString();
}

如有bug，请帮忙指出