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JS的unshift()和shift()
2022-06-23 14:24:00 【刘家奕_】
unshift()
-向数组开头添加一个或多个元素，并返回新的数组长度
-向前边插入元素以后，其他的元素索引会依次调整
与push（）大同小异，可以参考push（）的文章；
shift()
-可以删除数组的第一个元素，并将被册除的元素作为返回值返回
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