Vue数组添加元素的三种实现方式

var node1 = ['111','222']
var new_node = node1.push('aaa')

此时数据为
node1: ['111','222','aaa']

var node1 = ['111','222']
var new_node = node1.unshift('aaa')

此时数据为
node1: ['aaa','111','222']

 /**
     * Removes elements from an array and, if necessary, inserts new elements in their place, returning the deleted elements.
     * @param start The zero-based location in the array from which to start removing elements.
     * @param deleteCount The number of elements to remove.
     * @returns An array containing the elements that were deleted.
     */
    splice(start: number, deleteCount?: number): T[];
    /**
     * Removes elements from an array and, if necessary, inserts new elements in their place, returning the deleted elements.
     * @param start The zero-based location in the array from which to start removing elements.
     * @param deleteCount The number of elements to remove.
     * @param items Elements to insert into the array in place of the deleted elements.
     * @returns An array containing the elements that were deleted.
     */
    splice(start: number, deleteCount: number, ...items: T[]): T[];

var node = ['11','22','33','44']
var new_node = node.splice(1,2)
//返回被删除的数组元素
//new_node  输出 ['22','33']
console.log(new_node )
//node输出 ['11','44']
console.log(node)

var node = ['11','22','33','44']
//添加splice(start,0,newInfo)--返回值为空数组
var new_node = node.splice(1,0,'aa','bb')
// new_node 输出 []
console.log(new_node)
// node 输出 ['11', 'aa', 'bb', '22', '33', '44']
console.log(node)