javascript基础1,主要写(==和===的区别), Array对象, Object对象, this关键字,短路操作,Set集合,Map集合和String字符串操作。 1. == , === 1. === 在js中需要值相等类型相等 2. == 在js中值相等,类型不相等会自动转换 2.Array 全部Array的接口可以查看https://developer.mozilla.org/zh-CN/docs/Web...
function add(total,currentVal) { return total + currentVal; } var nums = [1,2,3,4]; console.log(nums.reduce(add)); 返回10. Javascript还提供了reduceRight()方法,和reduce()方法不同,它是从右到左执行的,下面demo是对数组中的字符串做操作,如下代码: function concat(accumulatedString,item) { r...
Array.prototype.map()方法:可以使用map()方法将字符串转换为字符数组。map()方法会遍历字符串的每个字符,并将其映射到一个新的数组中。 代码语言:txt 复制 var str = "Hello"; var arr = Array.prototype.map.call(str, function(char) { return char; }); console.log(arr); // ["H", "e", "...
arrayObject.lastIndexOf();从数组的末尾开始查找functionArrayIndexOf(arr,value){// 检测value在arr中出现的位置for(vari=0;i<arr.length;i++){if(arr[i]===value){returni;}}return-1;} 字符串对象 代码语言:javascript 代码运行次数:0 运行 AI代码解释 charAt()stringObject.charAt(index)返回stringObje...
5 ways to add an item to the end of an array. Push, Splice, and Length will mutate the original array. Concat and Spread won't and will return a new array...
source array, function [ ] 用于查询的数据源。可以是一个字符串数组或是一个函数。函数会接收到两个参数,分别是输入域中的 query值和process回调函数。函数可能会被同步调用,直接返回数据源;或者异步调用,通过process回调函数的唯一一个参数。 items number 8 下拉菜单中显示的最大的条目数。 minLength number 1...
Note: If you need to convert an array to a string in JavaScript, read this article. String.split() Method The String.split() method converts a string into an array of substrings using a separator and returns a new array. It splits the string every time it matches against the given se...
Almost anything can be converted into a string using toString(). You can add this at the end of the array to use this method, as shown below. It will take all the elements inside that array and concatenate them as a single string. var arr = ['Google', 'is', 'no', '1', '...
class MyClass {/*** This event is fired whenever the application navigates to a new page.* @eventProperty*/public readonly navigatedEvent: FrameworkEvent<NavigatedEventArgs>;} 1.2.7@example 指示应作为示例演示如何使用 API 的文档部分。 它可能包括代码示例。
build(deps-dev): bump karma-jasmine from 4.0.2 to 5.1.0 (#449) Jan 10, 2024 tsconfig.json [add] Create initial project Sep 29, 2019 README License binconv Binary converters for Blob, Uint8Array, ReadableStream, ArrayBuffer, string in JavaScript/TypeScript ...