js get the last element of the array All In One
jsgetthelastelementofthearrayAllInOneArray.prototype.at()//Array.at()constarr=[1,2,3,4,5];letindex=1;console.log(arr.at(index));//2letlastIndex=-1;console.log(arr.at(lastIndex));//5//等价于console.log(`\n`,arr[1])