shift: 删除原数组第一项, 并返回删除元素的值;如果数组为空则返回undefined
let a = [1, 2, 3, 4, 5]
let b = a.shift() //a:[2,3,4,5] b:1
unshift: 将参数添加到原数组开头, 并返回数组的长度
let a = [1, 2, 3, 4, 5]
let b = a.unshift(-2, -1) //a:[-2,-1,1,2,3,4,5] b:7
pop: 删除原数组最后一项, 并返回删除元素的值; 如果数组为空则返回undefined
let a = [1, 2, 3, 4, 5]
let b = a.pop(); //a:[1, 2, 3, 4] b:5
push: 将参数添加到原数组末尾, 并返回数组的长度
let a = [1, 2, 3, 4, 5]
let b = a.push(6, 7) //b:[1, 2, 3, 4, 5, 6, 7]
concat: 返回一个新数组, 是将参数添加到原数组中构成的
let a = [1, 2, 3, 4, 5];
let b = a.concat(6, 7); //a:[1,2,3,4,5] b:[1,2,3,4,5,6,7]
reverse: 将数组反序
var a = [1, 2, 3, 4, 5];
var b = a.reverse(); //a:[5,4,3,2,1] b:[5,4,3,2,1]
join(separator): 将数组的元素组起一个字符串, 以separator为分隔符, 省略的话则用默认用逗号为分隔符
let a = [1, 2, 3, 4, 5];
let b = a.join("|"); //a:[1,2,3,4,5] b:"1|2|3|4|5"
slice(start, end): 返回从原数组中指定开始下标到结束下标之间的项组成的新数组
let a = [1, 2, 3, 4, 5];
let b = a.slice(2, 5); //a:[1,2,3,4,5] b:[3,4,5]
sort(orderfunction): 按指定的参数对数组进行排序
let a = [1, 2, 3, 4, 5];
let b = a.sort(); //a:[1,2,3,4,5] b:[1,2,3,4,5]
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