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JS custom function with default value_javascript skills

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Release： 2016-05-16 18:04:43
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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.
Related labels：
function default value
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