javascript 常用方法整理 – 飞飞的个人网站

let class2type = {};
let toString = class2type.toString;
let hasOwn = class2type.hasOwnProperty;
let getProto = Object.getPrototypeOf;
let fnToString = hasOwn.toString;
let ObjectFunctionString = fnToString.call(Object);

("Boolean Number String Function Array Date RegExp Object Error Symbol").split(" ").forEach(function (name) {
  class2type["[object " + name + "]"] = name.toLowerCase();
});

//获取数据类型
let type = function (obj) {
  if (obj == null) {
    return obj + "";
  }

  // Support: Android <=2.3 only (functionish RegExp)
  return typeof obj === "object" || typeof obj === "function" ?
    class2type[toString.call(obj)] || "object" :
    typeof obj;
}

//判断是否为数组
let isArray = Array.isArray;

//判断是否为function
function isFunction(obj) {
  return type(obj) === "function";
}

//判断是否为数字类型
function isNumeric(obj) {
  // As of jQuery 3.0, isNumeric is limited to
  // strings and numbers (primitives or objects)
  // that can be coerced to finite numbers (gh-2662)
  let _type = type(obj);
  return (_type === "number" || _type === "string") &&
    // parseFloat NaNs numeric-cast false positives ("")
    // ...but misinterprets leading-number strings, particularly hex literals ("0x...")
    // subtraction forces infinities to NaN
    !isNaN(obj - parseFloat(obj));
}

//判断是否为空对象
function isEmptyObject(obj) {
  /* eslint-disable no-unused-vars */
  // See https://github.com/eslint/eslint/issues/6125
  var name;

  for (name in obj) {
    return false;
  }
  return true;
}

//判断是否为原生的对象
function isPlainObject(obj) {
  var proto, Ctor;

  // Detect obvious negatives
  // Use toString instead of jQuery.type to catch host objects
  if (!obj || toString.call(obj) !== "[object Object]") {
    return false;
  }

  proto = getProto(obj);

  // Objects with no prototype (e.g., `Object.create( null )`) are plain
  if (!proto) {
    return true;
  }

  // Objects with prototype are plain iff they were constructed by a global Object function
  Ctor = hasOwn.call(proto, "constructor") && proto.constructor;
  return typeof Ctor === "function" && fnToString.call(Ctor) === ObjectFunctionString;
}

//数组，对象复制，深度拷贝
function extend() {
  let target = arguments[0] || {};
  let i = 1;
  let length = arguments.length;
  let deep = false;
  let options;
  let name;
  let src;
  let copy;

  if (typeof arguments[0] === 'boolean') {
    deep = target;
    target = arguments[1] || {};
    i = 2;
  }
  if (typeof target !== 'object' && !isFunction(target)) {
    target = {};
  }
  for (; i < length; i++) {
    if ((options = arguments[i]) != null) {
      for (name in options) {
        src = target[name];
        copy = options[name];
        if (target === copy) {
          continue;
        }
        if (deep && copy && (isPlainObject(copy) || isArray(copy))) {
          var clone = src && (isPlainObject(src) || isArray(src)) ? src : isArray(copy) ? [] : {};
          target[name] = extend(deep, clone, copy);
        } else if (copy !== undefined) {
          target[name] = copy;
        }
      }
    }
  }
  return target;
}

//格式化数字,前面补零
function formatNumber(n) {
  n = n.toString()
  return n[1] ? n : '0' + n
}

//格式化时间.
function formatTime(date) {
  var year = date.getFullYear()
  var month = date.getMonth() + 1
  var day = date.getDate()

  var hour = date.getHours()
  var minute = date.getMinutes()
  var second = date.getSeconds()

  return [year, month, day].map(formatNumber).join('/') + ' ' + [hour, minute, second].map(formatNumber).join(':')
}

//获取指定文字的字节数
function getBytesLen(str) {
  if (str)
    return str.length + str.replace(/[\u0000-\u00ff]/g, '').length;
  return 0;
}

//转义字符，例如将将<img>转为为</img>
function pregQuote(str, delimiter) {
  // http://kevin.vanzonneveld.net
  return (str + '').replace(new RegExp('[.\\\\+*?\\[\\^\\]$(){}=!<>|:\\' + (delimiter || '') + '-]', 'g'), '\\$&');
}

//校验手机号码
function checkPhone(phone) {
  return /^(11|13|14|15|17|18|19)[0-9]{9}$/.test(phone);
}

//获取地址栏参数
function getParam(key, def, url) {
  var url = url || location.search,
    svalue = url.match(new RegExp('[\?\&]' + key + '=([^\&]*)(\&?)', 'i')),
    val = svalue ? svalue[1] : svalue;
  val = (val === null) ? '' : val;
  val = decodeURIComponent(val);
  return val || def || "";
}

module.exports = {
  formatTime: formatTime,
  getBytesLen: getBytesLen,
  pregQuote: pregQuote,
  checkPhone: checkPhone,
  replaceTag: function (txt, before, after) {
    txt = txt || '';
    txt = txt.replace("{", before);
    txt = txt.replace("}", after);
    return txt;
  },
  type: type,
  isArray: isArray,
  isFunction: isFunction,
  isNumeric: isNumeric,
  isEmptyObject: isEmptyObject,
  isPlainObject: isPlainObject,
  extend: extend,
  getParam:getParam
}

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let class2type = {};

let toString = class2type.toString;

let hasOwn = class2type.hasOwnProperty;

let getProto = Object.getPrototypeOf;

let fnToString = hasOwn.toString;

let ObjectFunctionString = fnToString.call(Object);

("Boolean Number String Function Array Date RegExp Object Error Symbol").split(" ").forEach(function (name) {

class2type["[object " + name + "]"] = name.toLowerCase();

});

//获取数据类型

let type = function (obj) {

if (obj == null) {

return obj + "";

}

// Support: Android <=2.3 only (functionish RegExp)

return typeof obj === "object" || typeof obj === "function" ?

class2type[toString.call(obj)] || "object" :

typeof obj;

}

//判断是否为数组

let isArray = Array.isArray;

//判断是否为function

function isFunction(obj) {

return type(obj) === "function";

}

//判断是否为数字类型

function isNumeric(obj) {

// As of jQuery 3.0, isNumeric is limited to

// strings and numbers (primitives or objects)

// that can be coerced to finite numbers (gh-2662)

let _type = type(obj);

return (_type === "number" || _type === "string") &&

// parseFloat NaNs numeric-cast false positives ("")

// ...but misinterprets leading-number strings, particularly hex literals ("0x...")

// subtraction forces infinities to NaN

!isNaN(obj - parseFloat(obj));

}

//判断是否为空对象

function isEmptyObject(obj) {

/* eslint-disable no-unused-vars */

// See https://github.com/eslint/eslint/issues/6125

var name;

for (name in obj) {

return false;

}

return true;

}

//判断是否为原生的对象

function isPlainObject(obj) {

var proto, Ctor;

// Detect obvious negatives

// Use toString instead of jQuery.type to catch host objects

if (!obj || toString.call(obj) !== "[object Object]") {

return false;

}

proto = getProto(obj);

// Objects with no prototype (e.g., `Object.create( null )`) are plain

if (!proto) {

return true;

}

// Objects with prototype are plain iff they were constructed by a global Object function

Ctor = hasOwn.call(proto, "constructor") && proto.constructor;

return typeof Ctor === "function" && fnToString.call(Ctor) === ObjectFunctionString;

}

//数组，对象复制，深度拷贝

function extend() {

let target = arguments[0] || {};

let i = 1;

let length = arguments.length;

let deep = false;

let options;

let name;

let src;

let copy;

if (typeof arguments[0] === 'boolean') {

deep = target;

target = arguments[1] || {};

i = 2;

}

if (typeof target !== 'object' && !isFunction(target)) {

target = {};

}

for (; i < length; i++) {

if ((options = arguments[i]) != null) {

for (name in options) {

src = target[name];

copy = options[name];

if (target === copy) {

continue;

}

if (deep && copy && (isPlainObject(copy) || isArray(copy))) {

var clone = src && (isPlainObject(src) || isArray(src)) ? src : isArray(copy) ? [] : {};

target[name] = extend(deep, clone, copy);

} else if (copy !== undefined) {

target[name] = copy;

}

return target;

}

//格式化数字,前面补零

function formatNumber(n) {

n = n.toString()

return n[1] ? n : '0' + n

}

//格式化时间.

function formatTime(date) {

var year = date.getFullYear()

var month = date.getMonth() + 1

var day = date.getDate()

var hour = date.getHours()

var minute = date.getMinutes()

var second = date.getSeconds()

return [year, month, day].map(formatNumber).join('/') + ' ' + [hour, minute, second].map(formatNumber).join(':')

}

//获取指定文字的字节数

function getBytesLen(str) {

if (str)

return str.length + str.replace(/[\u0000-\u00ff]/g, '').length;

return 0;

}

//转义字符，例如将将<img>转为为</img>

function pregQuote(str, delimiter) {

// http://kevin.vanzonneveld.net

return (str + '').replace(new RegExp('[.\\\\+*?\\[\\^\\]$(){}=!<>|:\\' + (delimiter || '') + '-]', 'g'), '\\$&');

}

//校验手机号码

function checkPhone(phone) {

return /^(11|13|14|15|17|18|19)[0-9]{9}$/.test(phone);

}

//获取地址栏参数

function getParam(key, def, url) {

var url = url || location.search,

svalue = url.match(new RegExp('[\?\&]' + key + '=([^\&]*)(\&?)', 'i')),

val = svalue ? svalue[1] : svalue;

val = (val === null) ? '' : val;

val = decodeURIComponent(val);

return val || def || "";

}

module.exports = {

formatTime: formatTime,

getBytesLen: getBytesLen,

pregQuote: pregQuote,

checkPhone: checkPhone,

replaceTag: function (txt, before, after) {

txt = txt || '';

txt = txt.replace("{", before);

txt = txt.replace("}", after);

return txt;

type: type,

isArray: isArray,

isFunction: isFunction,

isNumeric: isNumeric,

isEmptyObject: isEmptyObject,

isPlainObject: isPlainObject,

extend: extend,

getParam:getParam

}

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