从url获取参数并添加到链接

// 获取当前页面的URL
var url = window.location.href;

// 解析URL中的参数
var params = {};
var paramStr = url.split('?')[1];
if (paramStr) {
  var paramArr = paramStr.split('&');
  for (var i = 0; i < paramArr.length; i++) {
    var param = paramArr[i].split('=');
    var key = decodeURIComponent(param[0]);
    var value = decodeURIComponent(param[1]);
    params[key] = value;
  }
}

// 构建新的链接并添加参数
var newUrl = 'https://example.com/somepage';
for (var key in params) {
  newUrl += (newUrl.indexOf('?') === -1 ? '?' : '&') + key + '=' + params[key];
}

// 输出新的链接
console.log(newUrl);