One problem per day _javascript. Two ways to implement page load after the onload binding multiple functions?

Specific requirements:

1. Binding multiple execution functions for onload events triggered after a webpage is loaded

Implementation ideas:

1. You can bind an anonymous function directly to onload, and the anonymous function calls multiple functions inside

2. You can customize a function, first save the previous window.onload value, and then determine whether the type of window.onload is a function, if not let window.onload is set to a custom function, otherwise the function that is bound before window.onload is executed before the custom function

Specific code:

<! doctype html>

Summary description:
1. It is strongly recommended that the second more flexible way to create multi-function binding, in fact, this method can also support most of the built-in event processing methods, but it is important to note that the function must be assigned to Window.onload, do not directly call, otherwise there will be unexpected results.
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One problem per day _javascript. Two ways to implement page load after the onload binding multiple functions?