Router.js

let rules = [];

function appendRule(path, callback) {
  rules.push([path, callback]);
}

function matchPath(path, currentPath) {
  let params = {};

  // If there's a '/' in the end of path, trim it.
  currentPath = currentPath.replace(/\/$/, '');

  let pathRegExp = path.replace(/\/$/, '')
    .replace(/\*/g, '.*')
    .replace(/\/:([^?\/])+/g, '(/[^/]+)')
    .replace(/\//g, '\\/');

  pathRegExp = new RegExp('^' + pathRegExp + '$');

  let paramNames = path.match(/:([^?\/])+/g);

  if (paramNames) {
    for (let i = 0, len = paramNames.length; i < len; i++) {
      paramNames[i] = paramNames[i].substr(1);
    }
  }

  let matches = pathRegExp.exec(currentPath);

  if (matches === null) {
    return false;
  } else {
    matches.shift();

    for (let i = 0, len = matches.length; i < len; i++) {
      if (matches[i]) {
        params[paramNames[i]] = matches[i].substr(1);
      }
    }

    return params;
  }
}

let validateIndex = 0;

function exec() {
  validateIndex = 0;
  validate();
}

function validate() {
  if (validateIndex < rules.length) {
    let next = function() {
      validateIndex++;
      validate();
    };

    let params = matchPath(rules[validateIndex][0], location.pathname);
    if (params) {
      rules[validateIndex][1](params, next);
    } else {
      next();
    }
  }

  return;
}

let interphace = {
  add: appendRule,
  exec: exec
};

export default interphace;