JS数组删除指定下标元素

splice方法——Array.splice(index,n)

参数语义化理解：删除以下标index为起点的n个元素。(之后的元素会往前移动)

注意:splice会直接改变原数组

let arr=['a','b','c','d'];arr.splice(2,1);console.log(arr); //['a','b','d']

let arr=['a','b','c','d'];arr.splice(0,4);console.log(arr); //[]

let arr=['a','b','c','d'];arr.splice(0,2);console.log(arr); //['c','d']