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()
        : "";
    }
  }
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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：http://www.mark-to-win.com/tutorial/50895.html