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If an event is no longer needed, we can delete it with a drop event statement. With this statement, we do not need to wait until the last event call.EventArgs e=new EventArgs ();1. The combination of shift + z (model full window) and ctrl + shift + w (box selection window) can greatly reduce the sliding of the mouse wheel.但往往，事情不会按照计划如愿进行。该片由《师任堂》《风云碑》的尹尚浩执导，《99亿女人》《不夜城》韩智勋执笔，讲述梦想着成为太王，从而利用恩达之心的平冈与像傻瓜一样只牺牲自己的温达之间哀切的爱情故事。From the above command class code, we can see that any operation has an execute method to perform the operation. The above code uses traditional object-oriented programming to implement the command mode. The procedural request call of the command mode is encapsulated in the execute method of the command object. Have we found the above writing code a little cumbersome? We can do this using the callback functions in javascript, In object-oriented, The receiver of the command mode is saved as an attribute of the command object, and the command execution operation is agreed to call the command.execute method. However, if we use the callback function, then the receiver is closed in the environment where the callback function is generated, and the execution operation will be simpler. Only the callback function can be executed. Let's look at the following code: