您好,登錄后才能下訂單哦!
這期內(nèi)容當(dāng)中小編將會(huì)給大家?guī)?lái)有關(guān)如何在JavaScript中遍歷Array對(duì)象,文章內(nèi)容豐富且以專(zhuān)業(yè)的角度為大家分析和敘述,閱讀完這篇文章希望大家可以有所收獲。
1.forEach(),遍歷數(shù)組的每個(gè)元素
let arrFor = ['muzi','digbig','muzidigbig','lucky'] //forEach(),遍歷數(shù)組的每個(gè)元素 arrFor.forEach((item,index) => { console.log(`${index}---${item}`) })
2.map(參數(shù)為回調(diào)函數(shù))函數(shù),遍歷數(shù)組每個(gè)元素,并回調(diào)操作,需要返回值,返回值組成新數(shù)組,原數(shù)組不變;
let arr = [{id:1,name:'muzi'},{id:2,name:'digbig'},{id:3,name:'muzidigbig'},{id:4,name:'lucky'}] const arrMap = arr.map((item,index) => { return { id:item.id, name:item.name, sex:'男' } }) console.log(arrMap)
3.filter(參數(shù)為回調(diào)函數(shù))函數(shù):過(guò)濾通過(guò)條件的元素組成一個(gè)新數(shù)組,原數(shù)組不變;
let arr = [{id:1,name:'muzi'},{id:2,name:'digbig'},{id:3,name:'muzidigbig'},{id:4,name:'lucky'}] const arrFilter = arr.filter((item,index) => { return item.id >= 2; }) console.log(arrFilter)
4.some(參數(shù)為回調(diào)函數(shù))函數(shù),遍歷數(shù)組中是否有符合條件的函數(shù),返回布爾值;
let arr = [{id:1,name:'muzi'},{id:2,name:'digbig'},{id:3,name:'muzidigbig'},{id:4,name:'lucky'}] const arrSome = arr.some((item,index) => { return item.id === 5 }) console.log(arrSome)
5.every(參數(shù)為回調(diào)函數(shù))函數(shù),遍歷數(shù)組是否每個(gè)元素都符合條件,返回布爾值;
let arr = [{id:1,name:'muzi'},{id:2,name:'digbig'},{id:3,name:'muzidigbig'},{id:4,name:'lucky'}] const arrEvery = arr.every((item,index) => { return item.id >= 1 }) console.log(arrEvery)
6.find()函數(shù),數(shù)組中的每個(gè)元素都執(zhí)行這個(gè)回調(diào)函數(shù);返回第一個(gè)滿足條件的元素 之后的元素就不在調(diào)用;沒(méi)有符合的返回undefined;并沒(méi)有改變數(shù)組的原始值。
let arr = [{id:1,name:'muzi'},{id:2,name:'digbig'},{id:3,name:'muzidigbig'},{id:4,name:'lucky'}] const arrFind = arr.find((item,index) => { return item.id === 1 }) console.log(arrFind)
7.reduce(),合并二維數(shù)組
var twoArr = [['mu','zi'],['dig','big'],['lucky','jiji']]; var oneArr = twoArr.reduce(function(total,currentValue){ // console.log(total) return total.concat(currentValue); },[]) console.log(oneArr);//["mu", "zi", "dig", "big", "lucky", "jiji"]
JavaScript是一種直譯式的腳本語(yǔ)言,其解釋器被稱為JavaScript引擎,是瀏覽器的一部分,JavaScript是被廣泛用于客戶端的腳本語(yǔ)言,最早是在HTML網(wǎng)頁(yè)上使用,用來(lái)給HTML網(wǎng)頁(yè)增加動(dòng)態(tài)功能。
上述就是小編為大家分享的如何在JavaScript中遍歷Array對(duì)象了,如果剛好有類(lèi)似的疑惑,不妨參照上述分析進(jìn)行理解。如果想知道更多相關(guān)知識(shí),歡迎關(guān)注億速云行業(yè)資訊頻道。
免責(zé)聲明:本站發(fā)布的內(nèi)容(圖片、視頻和文字)以原創(chuàng)、轉(zhuǎn)載和分享為主,文章觀點(diǎn)不代表本網(wǎng)站立場(chǎng),如果涉及侵權(quán)請(qǐng)聯(lián)系站長(zhǎng)郵箱:is@yisu.com進(jìn)行舉報(bào),并提供相關(guān)證據(jù),一經(jīng)查實(shí),將立刻刪除涉嫌侵權(quán)內(nèi)容。