js获取域名代码

var fullURL = window.location.href;
console.log(fullURL);

var domain = window.location.hostname;
console.log(domain);

var protocol = window.location.protocol;
console.log(protocol); // 输出 "http:" 或 "https:"

var port = window.location.port;
console.log(port); // 如果没有指定端口，返回空字符串

var pathname = window.location.pathname;
console.log(pathname);

var search = window.location.search;
console.log(search); // 包含 "?"

function getQueryParamByName(name, url = window.location.href) {
    name = name.replace(/[\[\]]/g, '\\$&');
    var regex = new RegExp('[?&]' + name + '(=([^&#]*)|&|#|$)'),
        results = regex.exec(url);
    if (!results) return null;
    if (!results[2]) return '';
    return decodeURIComponent(results[2].replace(/\+/g, ' '));
}

var paramValue = getQueryParamByName('paramName');
console.log(paramValue);