1、pop方法从数组中删除最后一个元素，并返回该元素的值。

vararray=["cat","dog","cow","chicken","mouse"]
varitem=array.pop()
console.log(array)//["cat","dog","cow","chicken"]
console.log(item)//mouse

2、push方法将一个或多个元素添加到数组的末尾，并返回该数组的新长度。

vararray=["football","basketball","badminton"]
vari=array.push("golfball")
console.log(array)//["football","basketball","badminton","golfball"]
console.log(i)//4

3、 reverse方法将数组中元素的位置颠倒，并返回该数组。

vararray=[1,2,3,4,5]
vararray2=array.reverse()
console.log(array)//[5,4,3,2,1]
console.log(array2===array)//true

以上就是js改变自身值的方法，希望对大家有所帮助。