JS删除数组中某个元素的四种方式总结

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

var arr = [1,2,3,4,5] var new_arr = [] for (let i = 0, len = arr.length; i  [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] 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 arr = [1,2,3,4,5] arr.shift() // arr => [2,3,4,5]

var arr = [1,2,3,4,5], element = 2 arr = arr.filter(item => item != element) // arr => [1,3,4,5]

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, 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  [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]

var delete_index = 2 var 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  [1,2,3,4,5] // new_arr => [1,2,4,5]