截取url中想要的参数

getQueryString(url: string, name: string) {
    const reg = new RegExp('(^|\\?|&)' + name + '=([^&]*)(\\s|&|$)', 'i');
    if (reg.test(url)) return unescape(RegExp.$2.replace(/\+/g, ' '));
    return '';
 }