在文件编译器中没有为struct变量分配适当的内存。 在调试时会引发EXC_BAD_ACCESS（代码= 1，地址= 0x8）错误。
编译器未将有效内存分配给变量
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You never initialized head, so it points to some random location. You should do something along the lines of head = (doubly_linked_list*)malloc(sizeof(doubly_linked_list)) first. This will allocate a new doubly_linked_list struct and assign it to head. And of course you probably need to free it later
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