uitls

标签：return object rev param str date uitls

1.当前星期几
* @params 无
* @returns String
export function getWeekDate() {
var now = new Date();
var day = now.getDay();
var weeks = new Array("周日", "周一", "周二", "周三", "周四", "周五", "周六");
var week = weeks[day];
return week;
}

2.当前时间
 * @param { date } // new Date() 2022-12-20T02:42:56.883Z
 * @param { str } // 日期格式 yyyy-MM-dd hh:mm:ss
 * @returns { String } // 2022-12-20 10:42:18
export function formatDate(date, str) {
  date = new Date(date);
  str = str ? str : "yyyy/MM/dd hh:mm:ss";
  if (/(y+)/.test(str)) {
    str = str.replace(RegExp.$1, String(date.getFullYear()).substr(4 - RegExp.$1.length));
  }
  let o = {
    "M+": date.getMonth() + 1,
    "d+": date.getDate(),
    "h+": date.getHours(),
    "m+": date.getMinutes(),
    "s+": date.getSeconds(),
  };
  for (let k in o) {
    if (new RegExp(`(${k})`).test(str)) {
      let stry = String(o[k]);
      str = str.replace(RegExp.$1, RegExp.$1.length === 1 ? stry : ("00" + stry).substr(stry.length));
   }
  }
  return str;
}

3.去重数组
 * @param { 去重数组 } Array
 * @param { 去重依赖的属性 } key
 * @returns  Array 去重后的数组
export function uniqueArray(arr = [], key) {
  const keyValues = new Set();
  let val;
  return arr.filter((obj) => {
    val = obj[key];
    if (keyValues.has(val)) {
      return false;
    }
    keyValues.add(val);
    return true;
  });
}

4.复杂List排序
 * @param 需要依赖sort() // 例如 ——>  const res = arr.sort(sortBy("id", false));
 * @param { 排序依赖的属性 } attr
 * @param { true为正序，false为倒叙 } rev
 * @returns
export function sortBy(attr, rev) {
  if (rev == undefined) {
    rev = 1;
  } else {
    rev = rev ? 1 : -1;
 }
  return function (a, b) {
    a = Number(a[attr]);
    b = Number(b[attr]);
    if (a < b) {
      return rev * -1;
    }
    if (a > b) {
      return rev * 1;
    }
    return 0;
  };
}

5.检查数据类型
 * @param { 检查的对象 } obj
 * @returns
export function dataType(obj) {
  var toString = Object.prototype.toString;
  var map = {
    "[object Boolean]": "boolean",
    "[object Number]": "number",
    "[object String]": "string",
    "[object Function]": "function",
    "[object Array]": "array",
    "[object Date]": "date",
    "[object RegExp]": "regExp",
    "[object Undefined]": "undefined",
    "[object Null]": "null",
    "[object Object]": "object",
  };
  return map[toString.call(obj)];
}

标签：return,object,rev,param,str,date,uitls
From： https://www.cnblogs.com/songkomei/p/16993755.html