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- let arr = ['a', 'b', 'c']
- let len = arr.unshift(1, 0)
- console.log(arr) // ['1', '0', 'a', 'b', 'c']
- console.log(len) // 5
- let arr = ['a', 'b', 'c']
- let add = arr.splice(1, 0, 'a', 'b')
- console.log(arr) // ['a', 'a', 'b', 'b', 'c']
- console.log(add) // []
- let arr = ['a', 'b', 'c']
- let add = arr.concat('e', ['f', 'g'])
- console.log(add) // ['a', 'b', 'c', 'e', 'f', 'g']
- console.log(arr) // ['a', 'b', 'c']
- let letters = ['a', 'b', 'c', 'd', 'e']
- let letters1 = letters.splice(1,2)
- console.log(letters) // ['a', 'd', 'e']
- console.log(letters1) //['b', 'c']
- let letters = ['a', 'b', 'c', 'd', 'e']
- let letters1 = nums.slice(1) //['b', 'c', 'd', 'e']
- let letters2 = nms.slice(1,3) //['b', 'c']
- let arr = ['a', 'b', 'c']
- let remove = arr.splice(1,1, 'd', 'f')
- console.log(arr) // ['a', 'd', 'f', 'c']
- console.log(remove) // 'b'
查找元素返回元素坐标或者元素值
- let arr = [1,2,3]
- arr.indexOf(2) == 1
- let arr = ['xx', 'banana', 'hah']
- arr.includes('mm') //false
- let stus =[
- {
- name: 'xx',
- age: '20'
- },{
- name: 'xx1',
- age: '18'
- },{
- name: 'xx2',
- age: '15'
- }
- ]
- stus.find((currentValue, index, arr) => {
- return currentValue.age > 18
- }) //{name: 'xx', age: '20'}
- let arr = [1, 2, 3]
- let result = arr.reserve()
- console.log(result) // [3, 2, 1]
- function compare(a, b) {
- return b - a
- }
- let arr = [1, 2, 3]
- arr.sort(compare)
- let arr = [1, 2, 3]
- let result = arr.join('.')
- console.log(result) //1.2.3
- let arr = [1, 2, 3]
- let result = arr.reserve()
- console.log(result) // [3, 2, 1]
- let arr = [1, 2, 3]
- let result = arr.every((item, index, array) => {
- return item > 2
- })
- console.log(result) //false
- let arr = [1, 2, 3]
- let result = arr.filter((item, index, array) => {
- return item > 1
- })
- console.log(result) // [2, 3]
- let arr = [1, 2, 3]
- let result = arr.map((item, index, array) => {
- return item*2
- })
- console.log(result) // [2, 4, 6]
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