ds_list_create();
返回： Real（实数）
这个方法将新建一个列表数据结构，并返回这个列表的索引值这个索引值应当存储到变量中，以便与其它函数来调用这个列表。Note that if you try and access a value in the list before it has been populated - i.e. the list is "empty" - then the return value may be 0 since internally the first few entries in the list are set when created to minimize performance issues when initially adding items to the list (although the ds_list_size() function will still return 0 on a newly created list). If you wish to ensure that the list is "truly" empty on create, then you should call ds_list_clear() after creating the list, which will then mean that any values returned for unpopulated list slots will be undefined.
list = ds_list_create();
这行代码会创建一个新的列表，并将这个列表的索引值赋予名为“list”的变量。