假设有许多不同类的对象，且将它们放在一个数组中，然后使用同样的函数调用堆它们执行特定的操作。-Virtual function: Suppose there are many different classes of objects, and place them in an array, then use the same function call stack them to perform specific operations.

具体在Vb及javascr ipt中调用柯达控件的例子见da_frmScan.frm及scaner.txt两个文件。-Specific call in Vb and Kodak controls javascr ipt examples see da_frmScan.frm and scaner.txt two files.