判断数组中是否有相同的项

Posted 2020-12-14 wuqilang

// 判断数组中是否有同一项，例如：["111","22","33","111"] 返回true
export const isRepeat = arr => {
  var hash = {}
  for (var i in arr) {
    if (hash[arr[i]])
      //hash 哈希
      return true
    hash[arr[i]] = true
  }
  return false
}