How to modify an array in vue? What are the methods?

Vue is a popular front-end framework for building interactive web interfaces. The method of modifying arrays in Vue is very important, because we often need to deal with arrays during development. This article mainly introduces how to modify arrays in Vue.

1. Modify the array directly in Vue:
Data can be modified directly in Vue. Use the $set method in Vue to insert new values ​​into the array.

1. Use the Vue.set method to insert new values:

Vue.set(vm.list, index, newValue);

Among them, vm.list is the array to be modified, index is the index where the new value is to be inserted, and newValue is the new value.

2. Use the Vue.delete method to delete an array element:

Vue.delete(vm.list, index);

Among them, vm.list is the array of elements to be deleted, and index is the index of the element to be deleted.

2. Use the splice method in Vue to modify the array:
The splice method in Vue can modify the contents of the array. The splice method has the following parameters:

array.splice(start, deleteCount, item1, item2, itemN);

1. start: required. Specifies where to add/remove elements.
2. deleteCount: required. Specifies how many elements should be removed. Must be a number, but can be "0".
3. item1, item2, itemN: optional. The new element to be added to the array.

The sample code for adding new elements using the splice method is as follows:

vm.list.splice(index, 0, newValue);

Among them, vm.list is the array to be modified, index is the position where the new value is to be inserted, and newValue is the new value.

The sample code for using the splice method to delete elements is as follows:

vm.list.splice(index, 1);

Among them, vm.list is the array of elements to be deleted, index is the index of the element to be deleted, 1 means to delete 1 element .

Shortcuts:
Vue provides some shortcuts to modify arrays. These methods include:

1. push
   Use the push method to add elements to the end of the array. For example:

vm.list.push(newValue);

Among them, vm.list is the array to be modified, and newValue is the new element.

2. pop
   Use the pop method to delete the last element of the array. For example:

vm.list.pop();

where vm.list is the array of elements to be deleted.

3. shift
   Use the shift method to delete the first element of the array. For example:

vm.list.shift();

where vm.list is the array of elements to be deleted.

4. unshift
   Use the unshift method to add elements to the beginning of the array. For example:

vm.list.unshift(newValue);

Among them, vm.list is the array to be modified, and newValue is the new element.

Summary:
It is very important to modify the array in Vue. This article introduces several methods to modify the array in Vue: directly modify the array, use the splice method to modify the array and the shortcuts provided in Vue. Using these methods to modify arrays in Vue can improve development efficiency and reduce the difficulty of program maintenance.

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