这些JS工具函数够你用到2020年底了

前言

活不多说，自己平时搜集的干货函数奉上。
干货函数
视频全屏

  // 全屏
  function fullScreen(el) {
    const isFullscreen =
      document.fullScreen ||
      document.mozFullScreen ||
      document.webkitIsFullScreen;
    if (!isFullscreen) {
      //进入全屏,多重短路表达式
      (el.requestFullscreen && el.requestFullscreen()) ||
        (el.mozRequestFullScreen && el.mozRequestFullScreen()) ||
        (el.webkitRequestFullscreen && el.webkitRequestFullscreen()) ||
        (el.msRequestFullscreen && el.msRequestFullscreen());
    } else {
      //退出全屏,三目运算符
      document.exitFullscreen
        ? document.exitFullscreen()
        : document.mozCancelFullScreen
        ? document.mozCancelFullScreen()
        : document.webkitExitFullscreen
        ? document.webkitExitFullscreen()
        : "";
    }
  }

找出数字在数组中下一个相邻的元素

let i = “”;
let rr = [];

const name = (n, arr1)=>{
let num = Number(n);
for (let i = 0; i < arr1.length; i++) {
const element = arr1[i];
if (element != num) {
rr.push(num–);
}
}
return rr.find((el) => {
let newel = String(el);
return arr1.includes(newel);
})}

let arr = [“2”, “4”, “6”, “8”, “10”, “12”, “14”, “16”, “18”, “20”, “22”, “24”, “27”, “30”, “33”, “36”, “42”, “48”, “54”, “60”]
console.log(name(‘5’,arr)); //4

格式化时间

/**

• @param {number} time
• @param {string} option
• @returns {string}
  */
  function formatTime(time, option) {
  if ((’’ + time).length === 10) {
  time = parseInt(time) * 1000
  } else {
  time = +time
  }
  const d = new Date(time)
  const now = Date.now()

const diff = (now - d) / 1000

if (diff < 30) {
return ‘刚刚’
} else if (diff < 3600) {
// less 1 hour
return Math.ceil(diff / 60) + ‘分钟前’
} else if (diff < 3600 * 24) {
return Math.ceil(diff / 3600) + ‘小时前’
} else if (diff < 3600 * 24 * 2) {
return ‘1天前’
}
if (option) {
return parseTime(time, option)
} else {
return (
d.getMonth() +

 

更多内容请见原文，原文转载自：https://blog.csdn.net/weixin_44519496/article/details/119946230