Notes on array object splice method

Notes on splices

1. splice() belongs to the method of array object, if the object uses splice, an error will be reported:

{
    
    a:1}.splice

运行结果:Uncaught SyntaxError: Unexpected token .

2. splice will change the original array (slice will not):

	var arr = [0,1,2,3];
	arr.splice(2,1);
	console.log(arr)

运行结果:[0, 1, 3]

3. When only inserting elements, insert from the left of the index:

var arr = [0,1,2,3];
arr.splice(2,0,"b");
console.log(arr);

运行结果: [0, 1, "b", 2, 3]