匹配url占位符字段

/**
 * 正则Group匹配
 * 匹配url中 :id 等占位符字段
 */
function getMatches (string) {
  let matches = []
  let regex = /(:[a-z_]+)/
  let match = regex.exec(string)
  while (match !== null) {
    matches.push(match[1])
    string = string.replace(match[1], '')
    match = regex.exec(string)
  }
  return matches
}


console.log(getMatches("http://test.com/users/:id"))

// 输出结果
// :id

/**
 * 从URL匹配出参数pathParams
 * @param {string} url
 * @param {object} params
 * @returns {string}
 * @private
 */
_wrapUrl (url, params) {
  if (params !== null) {
    let matches = this._getMatches(url)
    for (let match of matches) {
      let value = params[match.replace(':', '')]
      if (value !== null) {
        url = url.replace(match, value)
      }
    }
  }
  return this.path + url
},