JavaScript高级程序设计学习笔记一：js数组push、pop、shift、unshift

push

向数组末尾添加项

let a = [1,2,3]
a.push(4,5)
console.log(a)

pop

删除数组最后一项

let a = [1,2,3]
a.pop()
console.log(a)

shift

删除数组第一项

let a = [1,2,3]
a.shift()
console.log(a)

unshift

向首添加项

let a = [1,2,3]
a.unshift(4,5)
console.log(a)