项目中js功能小结

直接上代码喽

/** * 使用闭包和展开运算符将参数数组映射到函数的输入。 */const spreadOver = fn => (argsArr = fn(...argsArr));//  例子const arrayMax = spreadOver(Math.max);arrayMax([1, 2, 3]); // -> 3arrayMax([1, 2, 4]); // -> 4/* * 把一个数组分成指定大小的小数组* arr:  拆分的数组参数* size:  小数组个数*/const chunk = (arr, size) =>  Array.from({ length: Math.ceil(arr.length / size) }, (v, i) =>    arr.slice(i * size, i * size + size)  );// chunk([1,2,3,4,5], 2) -> [[1,2],[3,4],[5]]/** 数组去重*/const valuesofArray = arr => [...new Set(arr)];// valuesofArray([1,2,2,3,4,4,5]) -> [1,2,3,4,5]/** 返回两个数组中不一样的元素*/const symmetricDifference = (a, b) => {  const sA = new Set(a),    sB = new Set(b);  return [...a.filter(x => !sB.has(x)), ...b.filter(x => !sA.has(x))];};// symmetricDifference([1,2,3], [1,2,4]) -> [3,4]/*  * 获取网站的url  */const currentURL = () => window.location.href;// currentUrl() -> 'https://google.com'/**  返回指定URL参数对象*/const getURLParameters = url =>  url    .match(/([^?=&]+)(=([^&]*))/g)    .reduce(      (a, v) => (        (a[v.slice(0, v.indexOf("="))] = v.slice(v.indexOf("=") + 1)), a      ),      {}    );// getURLParameters('http://url.com/page?name=Adam&surname=Smith') -> {name: 'Adam', surname: 'Smith'}/** 返回顶部 （平滑返回顶部）*/const scrollToTop = () => {  const c = document.documentElement.scrollTop || document.body.scrollTop;  if (c > 0) {    window.requestAnimationFrame(scrollToTop);    window.scrollTo(0, c - c / 8);  }};// scrollToTop()/*  * 将数字四舍五入到指定的数字位数。  */const round = (n, decimals = 0) =>  Number(`${Math.round(`${n}e${decimals}`)}e-${decimals}`);// round(1.005, 2) -> 1.01/** 将消息转换成语音* 使用SpeechSynthesisUtterance.voice和window.speechSynthesis.getVoices（）将消息转换为语音。使用window.speechSynthesis.speak（）播放消息。* API文档请看下面的链接* https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesisUtterance*/const speechSynthesis = message => {  const msg = new SpeechSynthesisUtterance(message);  msg.voice = window.speechSynthesis.getVoices()[0];  window.speechSynthesis.speak(msg);};// speechSynthesis('你试试看久知道了哦')/*  * 将json写入文件  */const fs = require("fs");const JSONToFile = (obj, filename) =>  fs.writeFile(`${filename}.json`, JSON.stringify(obj, null, 2));// JSONToFile({test: "is passed"}, 'testJsonFile') -> 将对象卸入到 'testJsonFile.json'文件/** 大写字符串的第一个字母*/const capitalize = ([first, ...rest], lowerRest = false) =>  first.toUpperCase() +  (lowerRest ? rest.join("").toLowerCase() : rest.join(""));// capitalize('myName') -> 'MyName'// capitalize('myName', true) -> 'Myname'/** 将字符串中每个单词的首字母大写。*/const capitalizeEveryWord = str =>  str.replace(/\b[a-z]/g, char => char.toUpperCase());// capitalizeEveryWord('hello world!') -> 'Hello World!'/** 颠倒字符串*/const reverseString = str =>  str    .split("")    .reverse()    .join("");// reverseString('foobar') -> 'raboof'/** 截断一个字符串到指定的长度。*/const truncateString = (str, num) =>  str.length > num ? str.slice(0, num > 3 ? num - 3 : num) + "..." : str;// truncateString('boomerang', 7) -> 'boom...'/** 生成一个uuid* 可在需要添加唯一行地方使用*/const UUIDGenerator = () =>  ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>    (      c ^      (crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (c / 4)))    ).toString(16)  );// UUIDGenerator() -> '7982fcfe-5721-4632-bede-6000885be57d'export {  arrayMax,  chunk,  valuesofArray,  symmetricDifference,  currentURL,  symmetricDifference,  getURLParameters,  scrollToTop,  round,  speechSynthesis,  truncateString,  UUIDGenerator};