js删除数组中的一个元素_js数组包含某个元素

var arr = [1,2,3,4,5]arr.pop()// arr => [1,2,3,4]

var arr = [1,2,3,4,5]var new_arr = arr.slice(0, -1)// arr => [1,2,3,4,5]// new_arr => [1,2,3,4]var arr = [1,2,3,4,5]var new_arr = arr.slice(0, arr.length - 1)// arr => [1,2,3,4,5]// new_arr => [1,2,3,4]

var arr = [1,2,3,4,5]var new_arr = arr.splice(-1)// arr => [1,2,3,4]// new_arr => [5]var arr = [1,2,3,4,5]var new_arr = arr.splice(-1, 1)// arr => [1,2,3,4]// new_arr => [5]var arr = [1,2,3,4,5]var new_arr = arr.splice(arr.length - 1)// arr => [1,2,3,4]// new_arr => [5]var arr = [1,2,3,4,5]var new_arr = arr.splice(arr.length - 1, 1)// arr => [1,2,3,4]// new_arr => [5]

var arr = [1,2,3,4,5]var new_arr = []for (let i = 0, len = arr.length; i < len; i++) {    if (i < len - 1) {        new_arr.push(arr[i])    }}// arr => [1,2,3,4,5]// new_arr => [1,2,3,4]

var arr = [1,2,3,4,5]arr.length = arr.length - 1// arr => [1,2,3,4]

var arr = [1,2,3,4,5]arr.shift()// arr => [2,3,4,5]

var arr = [1,2,3,4,5]var new_arr = arr.slice(1)// arr => [1,2,3,4,5]// new_arr => [2,3,4,5]

var arr = [1,2,3,4,5]var new_arr = arr.splice(0, 1)// arr => [2,3,4,5]// new_arr => [1]

var delete_index = 2var arr = [1,2,3,4,5]// arr => [1,2,3,4,5]var new_arr = arr.splice(delete_index, 1)// new_arr => [3]// arr => [1,2,4,5]

var delete_index = 2,    arr = [1,2,3,4,5],    new_arr = []for (let i = 0, len = arr.length; i < len; i++) {    if (i != delete_index) {        new_arr.push(arr[i])    }}// arr => [1,2,3,4,5]// new_arr => [1,2,4,5]

var element = 2,
    arr = [1,2,3,4,5]

arr.splice(arr.indexOf(2), 1)
// arr => [1,3,4,5]

var arr = [1,2,3,4,5],
    element = 2

arr = arr.filter(item => item != element)
// arr => [1,3,4,5]

var arr = [1,2,3,4,5],
    element = 2,
    new_arr = []
arr.forEach(item => (item != element && new_arr.push(item)))
// new_arr => [1,3,4,5]

// map 同理

var arr = [1,2,3,4,5],
    element = 2,
    new_arr = []

for (let i = 0; i < arr.length; i++) {
    arr[i] != element && new_arr.push(arr[i])
}
// new_arr => [1,3,4,5]

var arr = [1,2,3,4,5],
    element = 2
var new_set = new Set(arr)
new_set.delete(element)
var new_arr = [...new_set]
// new_arr => [1,3,4,5]