JS custom function with default value_javascript skills

I started to take it for granted that it might be like
js code in languages ​​​​such as php or python.

function test(a,b="er"){ alert(a b ); } However, after the definition, it keeps reporting an error: missing object .After inquiry, I found that it cannot be defined like this in JavaScript. You can take advantage of the fact that arguments is a real parameter group. Please refer to the following example: js code

Copy code

The code is as follows:

After testing, it worked. It seems that everything has its own rules and cannot be taken for granted. Write it down here so you don’t make the mistake again later.

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function default value

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