我目前有一个名为#include <iostream>
class foo{
public:
virtual void operator()() = 0;
virtual ~foo(){}
};
class bar: public foo{
public:
void operator()(){ std::cout << "bar" << std::endl;}
};
class car: public foo{
public:
void operator()(){ std::cout << "car" << std::endl;}
};
int main(int argc, char *argv[])
{
foo *a = new bar;
foo *b = new car;
//prints out the address of the two object:
//hence I know that they are being created
std::cout << a << std::endl;
std::cout << b << std::endl;
//does not call bar() instead returns the error mentioned above
//I also tried some obscure variation of the theme:
//*a(); *a()(); a()->(); a->(); a()();
//just calling "a;" does not do anything except throwing a warning
a();
//the following code works fine: when called it print bar, car respectivly as expected
// bar b;
// car c;
// b();
// c();
delete b;
delete a;
return 0;
}
的html文件，其中包含两个输入元素
abc.html该按钮只显示文本框值。
有没有办法可以添加一些url参数，以便我可以指定textbox的值。
当页面加载时，按钮是否可以自动启动。
Inshort我想提供url参数，这样当我打开url时，我只看到我在参数中传递的值。还应启动按钮<input type="text" id="txt"></input>
<input type="button" id="btn"></input>
事件。