/**
 * 为数组添加删除方法
 * @param {string} b 接收一个数组元素
 * @return boolean
 */
Array.prototype.remove = function (b) {
  const a = this.indexOf(b);
  if (a >= 0) {
    this.splice(a, 1);
    return true;
  }
  return false;
};

/**
 * 随机打乱数组
 *
 * @return {Array}
 */
Array.prototype.shuffle = function () {
  var input = this;

  for (var i = input.length - 1; i >= 0; i--) {
    var randomIndex = Math.floor(Math.random() * (i + 1));
    var itemAtIndex = input[randomIndex];

    input[randomIndex] = input[i];
    input[i] = itemAtIndex;
  }
  return input;
};

/**
 * 为window.location 添加查询params的方法
 * @param {string} b 接收一个字符串
 * @return null|string
 */
window.location.query = function (b) {
  const reg = new RegExp("(^|&|/?)" + b + "=([^&]*)(&|$)", "i");
  const r = window.location.href.substr(1).match(reg);
  if (r != null) return r[2];
  return null;
};



/**
 * 为window.location 添加查询当前平台的方法
 * @return null|string
 */
window.location.platform = function () {
  let platform = null;
  const useragent = navigator.userAgent;
  // prettier-ignore
  const platforms = ["Windows NT", "Linux", "Macintosh", "Android", "iPhone", "iPod", "iPad", "Windows Phone"];
  for (let i = 0; i <= platforms.length; i++) {
    if (useragent.indexOf(platforms[i]) > -1) {
      platform = platforms[i];
      break;
    }
  }
  return platform;
};