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push()  往数组最后面添加一个元素,成功返回当前数组的长度    pop()  删除数组的最后一个元素,成功返回删除元素的值    shift()  删除数组的第一个元素,成功返回删除元素的值unshift()  往数组最前面添加一个元素,成功返回当前数组的长度 splice()  有三个参数,第一个是想要删除的元素的下标(必选),第二个是想要删除的个数(必选),第三个是删除                后想要在原位置替换的值(可选)   sort()  使数组按照字符编码默认从小到大排…