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This article introduces the relevant knowledge of "what are the default and rest parameters of JavaScript ES6". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Default parameter

When creating functions with parameters that should have default values, we all use the following mode:

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Function getarea (WBH) {

Var w = w | | 10

Var h = h | | 15

Return w * h

}

With ES6 support for default parameters, the test date for explicitly defined parameter values ends:

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Function getarea (winter10, hong15) {

Return w * h

}

Getarea (5) / / returns 75

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