查询/删除url中的参数

/**
 * 获取url中的参数值
 * @param name 参数名称
 */
export function getQueryString(name) {
  const reg = new RegExp('(^|&)' + name + '=([^&]*)(&|$)')
  const r = window.location.search.substr(1).match(reg)
  if (r != null) {
    return unescape(r[2])
  }
  return null
}

/**
 * 删除url中的指定参数并返回新url
 * @param url 需要截取的url
 * @param ref 需要删除的参数名称
 */
export function delQueryString(url, ref, isEnCode = false) {
  let str = ''
  let newUrl = ''
  let hash = ''
  if (url.indexOf('#') !== -1) {
    hash = url.substr(url.indexOf('#'))
    url = url.split(hash)[0]
  }
  if (url.indexOf('?') !== -1) {
    str = url.substr(url.indexOf('?') + 1)
  } else {
    newUrl = url
  }
  let arr = []
  let returnurl = ''
  if (str.indexOf('&') !== -1) {
    arr = str.split('&')
    let index
    for (index in arr) {
      if (arr[index].split('=')[0] !== ref) {
        returnurl =
          returnurl +
          arr[index].split('=')[0] +
          '=' +
          arr[index].split('=')[1] +
          '&'
      }
    }
    newUrl =
      url.substr(0, url.indexOf('?')) +
      '?' +
      returnurl.substr(0, returnurl.length - 1)
  } else {
    arr = str.split('=')
    if (arr[0] === ref) {
      newUrl = url.substr(0, url.indexOf('?'))
    } else {
      newUrl = url
    }
  }
  newUrl = newUrl + hash
  return isEnCode ? encodeURIComponent(newUrl) : newUrl
}