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Browser onload event

2022-08-02 06:11:00 【memory bug】

The following code, because the code is executed from top to bottom, if the btn node is not created, it will error

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Solution: Use the onload event

onload event occurs as soon as the page or image has finished loading.

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onload is usually used for the element to execute script code after the page is fully loaded (including images, css files, etc.).

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