1.数组去重: 主要是使用的 new Set() 方法https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Set //两个方法 主要是使用到new Set()let repeatArr = [1,2,3,4,1,2,3,4]; let reasult= [...newSet(repeatArr)]//方法一 let reasult2 = Array.from(newSet(repea...
这些顺序容器,在JavaScript中是Array这个内置对象(js是基于对象的语言)。 其支持的方法看这个文档 https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Array 下面来简单总结一下: JavaScript数组对象 forEach:遍历 代码语言:javascript 代码运行次数:0 运行 AI代码解释 array.forEach(fu...
Array(5); // [ , , , , ] Array(1, 2, 3); // [1, 2, 3] // Array.isArray 用于确定传递的值是否是一个 Array Array.isArray([1, 2, 3]); // true Array.isArray({}); //false // Array.from 方法从一个类似数组或可迭代对象创建一个新的,浅拷贝的数组实例。 const arr = Arra...
3); // 从索引为3的位置开始//index is 3index = array.lastIndexOf(2, 2); // 从索引为2的位置开始向前找//index is 0index = array.lastIndexOf(2, -2);//index is 0index = array.lastIndexOf(2, -1);//index
jsdom allows you to intervene in the creation of a jsdom very early: after the Window and Document objects are created, but before any HTML is parsed to populate the document with nodes: const dom = new JSDOM(`Hello`, { beforeParse(window) { window.document.childNodes.length === 0; ...
console.log(function(){} instanceof Function); // true console.log({} instanceof Object); // true constructor 似乎完全可以应对基本数据类型和引用数据类型 但如果声明了一个构造函数,并且把他的原型指向了 Array 的原型,所以这种情况下,constructor 也显得力不从心 ...
引用类型: Object(包括Object/Array/RegExp/Date/null) 任何一个JavaScript的标识、常量、变量和参数都只是unfined, null, bool, number, string,symbol,object 和 function类型中的一种,也就typeof返回值表明的类型。——推荐阅读《细说JavaScript 七种数据类型》 js基本类型数据都是直接按值存储在栈中的(Undefined...
$.type(object) ⇒ string Get string type of an object. Possible types are: null undefined boolean number string function array date regexp object error. For other objects it will simply report “object”. To find out if an object is a plain JavaScript object, use isPlainObject.add...
Includes JavaScript methods, Python'sheapq modulemethods, and Java'sPriorityQueuemethods. Easy to use, known interfaces, tested, and well-documented JavaScript binary heap library. Instances areinteger min heapby default. Is it faster than sorting an array?
function_nonIterableSpread() { throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } function_unsupportedIterableToArray(o,...