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Oncopy and onpaste

2022-07-29 10:22:00 【Full stack programmer webmaster】

Hello everyone , I meet you again , I'm the king of the whole stack , I wish every programmer can learn more languages .

stay Javascript in , There are corresponding events that can listen to copy and paste , That's it oncopy and onpaste.

oncopy：

  • demo： 
<body oncopy="alert(' Can't copy ');return false;">
	 Can you copy me ？
</body>
  • Use scenarios ：
    • The page content on many sites does not agree to be copied , This can prevent users or programs from maliciously grabbing page data . Once starting point when reading novels , Just don't agree to copy the content , Now it's harder , The left button selection content and the right button menu are also blocked .

onpaste：

  • demo 
<input type="text" nane="cardNum" onpaste="return false;" />
  • Use scenarios ：
    • When transferring funds through online banking , Enter the opposite card number , You need to input twice , Usually, the input box entered for the second time does not agree to paste , This ensures the accuracy of the card number to a certain extent .

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