JavaScript 常用方法

`JavaScript` 常用方法

在前端开发过程中，很容易出现一些常用的或者常见的方法，下面是一些常用的 JavaScript 方法：

生成随机颜色

javascript 复制代码

function randomColor() {
  var letters = "0123456789ABCDEF";
  var color = "#";
  for (var i = 0; i < 6; i++) {
    color += letters[Math.floor(Math.random() * 16)];
  }
  return color;
}

console.log(randomColor()); // #E94221

生成随机指定长度的字符串

javascript 复制代码

function randomString(length) {
  var result = "";
  var characters =
    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
  var charactersLength = characters.length;
  for (var i = 0; i < length; i++) {
    result += characters.charAt(Math.floor(Math.random() * charactersLength));
  }
  return result;
}

console.log(randomString(10)); // "kL7y3b2v9z"

获取指定格式的日期、时间字符串

Javascript 复制代码

/**
 * @author Yh
 * @description 日期类
 * @date 2024-10-14
 * @version 1.0.0
 */

// 获取当前日期是星期几
function getWeek(date) {
  const day = date.getDay();
  const arr = ["日", "一", "二", "三", "四", "五", "六"];
  return "星期" + arr[day];
}

console.log(getWeek(new Date())); // 星期一

// 转换日期格式
function formatDate(date) {
  const year = date.getFullYear();
  const month = date.getMonth() + 1;
  const day = date.getDate();
  return `${year}-${month < 10 ? '0' + month : month}-${day < 10 ? '0' + day : day}`;
}

console.log(formatDate(new Date())); // 2024-10-14

// 转换时间格式
function formatTime(date) {
  const hour = date.getHours();
  const minute = date.getMinutes();
  const second = date.getSeconds();
  const h = hour < 10 ? '0' + hour : hour;
  const min = minute < 10 ? '0' + minute : minute;
  const s = second < 10 ? '0' + second : second;
  return `${h}:${min}:${s}`;
}

console.log(formatTime(new Date())); // 10:10:10

// 转换日期时间格式
function formatDateTime(date) {
  const year = date.getFullYear();
  const month = date.getMonth() + 1;
  const day = date.getDate();
  const hour = date.getHours();
  const minute = date.getMinutes();
  const second = date.getSeconds();
  const m = month < 10 ? '0' + month : month;
  const d = day < 10 ? '0' + day : day;
  const h = hour < 10 ? '0' + hour : hour;
  const min = minute < 10 ? '0' + minute : minute;
  const s = second < 10 ? '0' + second : second;
  return `${year}-${m}-${d} ${h}:${min}:${s}`;
}

console.log(formatDateTime(new Date())); // 2024-10-14 10:10:10

对象合并

javascript 复制代码

function mergeObject(obj1, obj2) {
  let obj = {};
  obj = { ...obj1, ...obj2 };
  return obj;
}

const obj1 = { a: 1, b: 2 };
const obj2 = { c: 3, d: 4 };
const obj3 = mergeObject(obj1, obj2);
console.log(obj3); // {a: 1, b: 2, c: 3, d: 4}

数组去重

javascript 复制代码

function unique(arr) {
  return Array.from(new Set(arr));
}

const arr = [1, 2, 3, 2, 1, 4, 5, 4];
const newArr = unique(arr);
console.log(newArr); // [1, 2, 3, 4, 5]