How to use window.onload

Let’s learn about the use of window.onload based on the case

Case 1

      
  显示第一个盒子 显示第二个盒子 显示第三个盒子 显示第四个盒子 
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In this case, if you put js in window.onload An error will be reported inside.

Analysis: The js placed in onload will wait for the html to be loaded before executing the function, but when loading the html, there isonclick="btn('box1')", this function will not be found (because the function has not been loaded at this time). To call this function, it must be loaded.

Case 2

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