About deleting an element in an array

let paixu = [1, 1, 1, 1, 1, 1, 1, 1, 2, 0, 1, 1]
paixu.splice(paixu.indexOf(0),1)  //paixu.indexOf(0)找出0的索引位置
console.log(paixu) //[1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1]

Note that if the value is assigned after deleting the element, the deleted element will be output

let paixu = [1, 1, 1, 1, 1, 1, 1, 1, 2, 0, 1, 1]
let aa=paixu.splice(paixu.indexOf(0),1)
console.log(aa) //[0]