将多个thread对象放到vector中，之后顺序执行join。看如下示例： vector<int> v_id(20);void f(int i){v_id[i] = i;}void call_by_main(){vector<thread> v;for (int i = 0; i < 20; ++i){v.push_back(thread(f,i));}for_each(v.be