替换json数组指定位置的对象

Question

var arr = [{id:1,pic:1},{id:2,pic:2},{id:3,pic:3}]

如何删掉arr第二项并且插入一个新的对象{id:4,pic:4}
结果如

arr = [{id:1,pic:1},{id:4,pic:4},{id:3,pic:3}]

Answer 1

arr.splice(1, 1, {id:4,pic:4});