written in front
this.arr[0]='adda';//It cannot be displayed on the page responsively
Modify array elements by index value, not a responsive method
Array Responsiveness
1.push() Add data at the end of the array
2.splice() implements insertion and deletion of elements
3.pop() deletes the last element
4.shift() deletes the first element of the array
5.unshift() add elements in front of the array
6.sort() sorts the array
7.reverse() reverses the array
Responsive modification through the set method
Vue.set(this.data.arr,0,'adda')