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oncontextmenu incident
The oncontextmenu event is a very useful event that can be used to disable the right-click menu, display a custom menu, perform confirmation operations, etc. By using the oncontextmenu event properly, we can improve the user experience and increase the interactivity of the page.
How to use oncontextmenu eventThe oncontextmenu event can be used to disable the right-click menu, display a custom menu, perform confirmation operations, etc. Detailed introduction: 1. Disable the right-click menu, use the addEventListener method to bind the contextmenu event to the document object; 2. Display the custom menu, first define a custom right-click menu, use CSS to hide it, and handle the contextmenu event In the function, the default right-click menu is prevented from popping up, etc.
How can we get the total number of all MySQL event related operations?With the help of the SHOWSTATUS statement, we can get the count of MySQL event-related operations. It can be used as follows -mysql>SHOWSTATUSLIKE'%event%';+--------------------------+------ -+|Variable_name |Value|+--------------------------+-------+|
What are the iframe listening events?The iframe listening events include onload event, onunload event, onbeforeunload event, onmessage event and onerror event. Detailed description: 1. Add an onload event, which is triggered when the content in the iframe is loaded; 2. Add an onunload event, which is triggered when the content in the iframe is unloaded; 3. Add an onbeforeunload event, which is triggered before the content in the iframe is unloaded. .
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