js删除数组最后一个元素
作者:xlnxin发布时间:2023-10-06分类:其他相关教程浏览:87
导读:slice删除123456789vararr=[1,2,3,4,5]varnew_arr=arr.slice(0,-1)//arr=>[1,2,3,4,...
slice 删除
1 2 3 4 5 6 7 8 9 | 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] |
splice 删除
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | 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] |
pop 删除
1 2 3 | var arr = [1,2,3,4,5] arr.pop() // arr => [1,2,3,4] |
for 删除
1 2 3 4 5 6 7 8 9 | 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] |
length 删除
1 2 3 | var arr = [1,2,3,4,5] arr.length = arr.length - 1 // arr => [1,2,3,4] |
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