export function getQueryString(name) {
  let reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i")
  let r = window.location.search.substr(1).match(reg)
  if (r != null) {
    return window.decodeURIComponent(r[2])
  }
  return null
}

export function getQueryStringByUrl(url = '', name = '') {
  let reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i")
  let r = url.split('?')[1].match(reg)
  if (r != null) {
    return window.decodeURIComponent(r[2])
  }
  return null
}

export function debounce(fn, delay) {
  let timer; // 定时器
  return function (...args) { // 形成闭包
    // args 为函数调用时传的参数。
    let context = this;
    timer && clearTimeout(timer); // 当函数再次执行时，清除定时器，重新开始计时
    // 利用定时器，让指定函数延迟执行。
    timer = setTimeout(function () {
      // 执行传入的指定函数，利用apply更改this绑定和传参
      fn.apply(context, args);
    }, delay)
  }
}

export function throttle(fn, thresh) {
  var timeout
  var start = new Date;
  var threshhold = thresh || 500
  return function () {

    var context = this, args = arguments, curr = new Date() - 0

    clearTimeout(timeout)//总是干掉事件回调
    if (curr - start >= threshhold) {
      fn.apply(context, args) //只执行一部分方法，这些方法是在某个时间段内执行一次
      start = curr
    } else {
      // 让方法在脱离事件后也能执行一次
      timeout = setTimeout(function () {
        fn.apply(context, args)
      }, threshhold);
    }
  }
}

export function setStorage(key, value) {
  return localStorage.setItem(key, JSON.stringify(value));
}

export function getStorage(key) {
  const item = localStorage.getItem(key);
  try {
    return item ? JSON.parse(item) : '';
  } catch (e) {
    return item;
  }
}

export function guid() {
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
    var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
    return v.toString(16);
  });
}

export function scaleNumber(num) {
  let length = num.toString().split('.')[1].length;

  let scale = '1';

  for (let i = 0; i < length; i++) {
    scale += '0';
  }

  let val = num * scale;
  return {
    val,
    scale
  };
}

export function getBit(value) {
  const reg = /([0-9]+\.[0-9]{4})[0-9]*/;
  if (value) {
    let str = value.toString();
    str = str.replace(reg, "$1");
    return str;
  } else {
    return value;
  }
}

export function getCookie(name) {
  var strcookie = document.cookie;//获取cookie字符串
  var arrcookie = strcookie.split("; ");//分割
  //遍历匹配
  for (var i = 0; i < arrcookie.length; i++) {
    var arr = arrcookie[i].split("=");
    if (arr[0] == name) {
      return arr[1];
    }
  }
  return "";
}

export function nextTick(fn, time = 50) {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      if (fn) fn();
      resolve();
    }, time)
  })
}

export function getBrowser() {
  let browser;
  let UserAgent = navigator.userAgent.toLowerCase();
  if (UserAgent.indexOf('chrome') > -1 && UserAgent.indexOf('safari') > -1) {
    browser = `Chrome`
  } else if (UserAgent.indexOf('firefox') > -1) {
    browser = `Firefox`
  } else if (UserAgent.indexOf('opera') > -1) {
    browser = `Opera`
  } else if (UserAgent.indexOf('safari') > -1 && UserAgent.indexOf('chrome') == -1) {
    browser = `Safari`
  } else if (UserAgent.indexOf('edge') > -1) {
    browser = `Edge`
  } else {
    browser = `Other`
  }
  return browser;
}

export function getOffsetRect(element) {
  var oTop = element.offsetTop;
  var oLeft = element.offsetLeft;
  var current = element.offsetParent;
  while (current !== null) {
    oTop += current.offsetTop;
    oLeft += current.offsetLeft;
    current = current.offsetParent;
  }
  return {
    top: oTop,
    left: oLeft,
  }
}

export function formatSecondsAsTime(secs) {
    var hr = Math.floor(secs / 3600)
    var min = Math.floor((secs - (hr * 3600)) / 60)
    var sec = Math.floor(secs - (hr * 3600) - (min * 60))
    var text
    if (hr < 10) {
        hr = "0" + hr
    }
    if (min < 10) {
        min = "0" + min
    }
    if (sec < 10) {
        sec = "0" + sec
    }
    if (hr == 0) {
        hr = ""
    }
    if (hr.length > 0) {
        text = hr + ':' + min + ':' + sec
    } else {
        text = min + ':' + sec
    }
    return text
    return fmt;
}