JS Array push函数

Question

JS里面array的push操作，如果被压进数组的元素也是个数组，真正被压进数组的是引用还是值？

 var a = [],b = [];
 a.push(1);
 b.push(a);
 a.push(2);
 console.log(b);

Edit 1:
如何做到push一个数组的值呢？

Answer 1

JSON.parse(JSON.stringify(arr));
创建一个arr的副本

Answer 2

是 引用

Answer 3

自己试试。是引用哦。

Answer 4

var numbers = [1, 2, 3];
numbers.push(4);
console.log(numbers); // [1, 2, 3, 4]

numbers.push(5, 6, 7);
console.log(numbers); // [1, 2, 3, 4, 5, 6, 7]

var sports = ['soccer', 'baseball'];
var total = sports.push('football', 'swimming');
console.log(sports); // ['soccer', 'baseball', 'football', 'swimming']
console.log(total);  // 4

var vegetables = ['parsnip', 'potato'];
var moreVegs = ['celery', 'beetroot'];
Array.prototype.push.apply(vegetables, moreVegs);
console.log(vegetables); // ['parsnip', 'potato', 'celery', 'beetroot']

Array.prototype.push()

Answer 5

是引用呢……这里我觉得你需要的是concat方法。