该函数将数组b的前n个元素追加到数组a的前m个元素后，假定数组a具有至少存放m+n个元素的空间。例如，如果数组a为{22,33,44,55,66,77,88,99}，数组b为{20,30,40,50,60,70,80,90}，则调用append(a,5,b,3)后，将把数组a变为{22,33,44,55,66,20,30,40}。注意数组b并没有改变，而且数组a中只需改变n个元素。-The function of the array b before the n additional elements of the array a after the former m elements, it is assumed that the array a has at least m+ n storage elements of the space. For example, if the array a for (22,33,44,55,66,77,88,99), the array b is (20,30,40,50,60,70,80,90), then call the append (a , 5, b, 3) after the array a will to (22,33,44,55,66,20,30,40). Attention to the array b has not changed, and an array of a change in only n elements.