javascript数组的增删改查

const names=["cyg","cyg1","cyg2","cyg3"];
//查询元素
console.log(names[1]);
console.log(names.length);
//遍历元素
for(const name of names)
{
	console.log(name);
}
//添加元素
names.push("liwen");
console.log(names.length);
//查询元素
const a=names.
findIndex(name=>name==='liwen');
console.log(a);
//删除元素
names.splice(2,1);
console.log(names);