Built-in Objects parseFloat() Array Object Array.pop() Array.slice() Array.unshift() Array.join() Array.findIndex() Array Slicing Methods Remove Element from Array Check Array is Empty Create Unique Array of Objects Convert Array to String String Object String.toLowerCase() String.toString...
通过join()方法可以实现重复字符串,只需传入字符串以及重复的次数,就能返回重复后的字符串,函数如下: function repeatString(str, n) { return new Array(n + 1).join(str); } console.log(repeatString("abc", 3)); // abcabcabc console.log(repeatString("Hi", 5)); // HiHiHiHiHi push()和pop...
写好JS 条件语句的 5 条守则 ,这里有5条让你写出更好/干净的条件语句的建议。...目录: 1.多重判断时使用 Array.includes 2.更少的嵌套,尽早 return 3.使用默认参数和解构 4.倾向于遍历对象而不是 Switch 语句 5.对 所有/部分 判断使用 Array.every...这种编码风格非常好,尤其是当你有很长的if语句的时...
for...in遍历数组的缺点:数组的下标index值是数字,而for...in遍历的index值(下标)的数据类型是字符串 for...in...循环值遍历可枚举属性。像Array和Object使用内置构造函数所创建的对象都会继承自Object.prototype和String.prototype的不可枚举属性,例如String的indexOf()方法或Object的toString()方法。循环将边路对象...
(typeof str == "string") { + try { + return JSON.parse(str); + } catch (e) { + console.log(e); + $.msg($.name, '', '请勿随意在BoxJs输入框修改内容\n建议通过脚本去获取cookie') + return []; + } + } +} + +async function getUA() { + $.UA = `jdapp;iPhone;10.4....
Array对象常用方法在数组末尾添加一个或多个元素 - push() 在数组末尾添加一个或多个元素,返回新长度,会修改原数组 var arr = [1, 2, 3, 4, 5] var len1...var arr3 = [1, 2, 3] var str = '123' console.log(Array.is...
If the value isn't in the array, we use the Array.push() method to add it. index.js const arr = ['a', 'b', 'c', 'd']; const value = 'e'; if (!arr.includes(value)) { arr.push(value); } // 👇️ [ 'a', 'b', 'c', 'd', 'e' ] console.log(arr); ...
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if (Array.isArray(obj)) { let arr = []; for (let item of obj) { arr.push(Object.assign(clone(item))); } return arr; } else if (obj == null) { return null; } else { let obj1 = {}; for (let index in obj) {
js code importFury,{InternalSerializerType,Type}from'@furyjs/fury';import*asfsfrom"fs";functionmain1(){constdescription=Type.object("example.bar",{c:Type.array(Type.object("example.foo",{a:Type.string()}))});constfury=newFury();const{serialize,deserialize}=fury.registerSerializer(description...