数组对象splice方法注意事项

splice注意事项

1.splice()属于数组对象的方法,若对象使用splice则会报错:

{
    
    a:1}.splice

运行结果:Uncaught SyntaxError: Unexpected token .

2.splice会改变原数组(slice不会):

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

运行结果:[0, 1, 3]

3.当只插入元素时,是从索引的左边插入:

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

运行结果: [0, 1, "b", 2, 3]