const utils = {
  getUserIP: function () {
    var MyPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection
    var pc = new MyPeerConnection({
      iceServers: []
    })
    var noop = function () {}
    var localIPs = {}
    var newObj = {}
    var ipRegex = /([0-9]{1,3}(\.[0-9]{1,3}){3}|[a-f0-9]{1,4}(:[a-f0-9]{1,4}){7})/g
    function iterateIP (ip) {
      if (!localIPs[ip]) localStorage.setItem('localip', ip)
      localIPs[ip] = true
      newObj['ip'] = ip
    }
    pc.createDataChannel('')
    pc.createOffer().then(function (sdp) {
      sdp.sdp.split('\n').forEach(function (line) {
        if (line.indexOf('candidate') < 0) return
        line.match(ipRegex).forEach(iterateIP)
      })
      pc.setLocalDescription(sdp, noop, noop)
    }).catch(function (reason) {
      // An error occurred, so handle the failure to connect
    })
    pc.onicecandidate = function (ice) {
      if (!ice || !ice.candidate || !ice.candidate.candidate || !ice.candidate.candidate.match(ipRegex)) return
      ice.candidate.candidate.match(ipRegex).forEach(iterateIP)
    }
    return newObj
  },
  // 小数加法
  accAdd (arg1, arg2) {
    var r1, r2, m, c
    try {
      r1 = arg1.toString().split('.')[1].length
    } catch (e) {
      r1 = 0
    }
    try {
      r2 = arg2.toString().split('.')[1].length
    } catch (e) {
      r2 = 0
    }
    c = Math.abs(r1 - r2)
    m = Math.pow(10, Math.max(r1, r2))
    if (c > 0) {
      var cm = Math.pow(10, c)
      if (r1 > r2) {
        arg1 = Number(arg1.toString().replace('.', ''))
        arg2 = Number(arg2.toString().replace('.', '')) * cm
      } else {
        arg1 = Number(arg1.toString().replace('.', '')) * cm
        arg2 = Number(arg2.toString().replace('.', ''))
      }
    } else {
      arg1 = Number(arg1.toString().replace('.', ''))
      arg2 = Number(arg2.toString().replace('.', ''))
    }
    return (arg1 + arg2) / m
  },
  // 乘法
  accMul (arg1, arg2) {
    var m = 0
    var s1 = arg1.toString()
    var s2 = arg2.toString()
    try { m += s1.split('.')[1].length } catch (e) {}
    try { m += s2.split('.')[1].length } catch (e) {}
    return Number(s1.replace('.', '')) * Number(s2.replace('.', '')) / Math.pow(10, m)
  }
}
export default utils