javascript change array length methods_js javascript change array length methods 改变数组长度的方法 push, pop shift, unshift, splice, fill,



javascript change array length methods

Array

  2. 改变数组长度的方法

push, pop

shift, unshift,

splice,

fill,

javascript change array length methods_js

javascript change array length methods_js_03

  2. 不改变数组长度的方法

map, forEach,

filter,

reduce, reduceRight,

some, every,

indexOf, lastIndexOf,

sort, reverse,

join,

includes,

concat,

entries, keys, values,

toString, toLocaleString,

find, findIndex,

flat

flatMap

copyWithin,

Array.from

Array.of

Array.isArray

Array.fill 改变数组长度 ❌

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// fill 填充
arr.fill(value[, start[, end]])


Array.splice 改变数组长度 ❌

​

// splice 拼接
let arrDeletedItems = array.splice(start[, deleteCount[, item1[, item2[, ...]]]])


Array.slice 不改变数组长度 ✅

​

// slice 切片

// string.slice(beginIndex[, endIndex])
array.slice([start[, end]])