JavaScript中的默认参数

发布于 2025-01-18 19:59:55 字数 405 浏览 0 评论 0原文

我想创建一个具有默认参数的函数，但我想使用一个默认参数，然后为下一个参数使用自定义值。例如，

function greet(name, greeting = 'Hey', question = 'How are you?') {
    console.log(`${greeting}, ${name}! ${question}`);
  }

greet('Jack', , 'You good?'); // tried this, doesn't work :(

如果我想说“嘿，Jack！你好吗？”，我使用第一个参数的默认值和默认值，但不使用第二个参数，该怎么办？我尝试过在函数调用中的逗号之间不加任何内容来调用该函数。有没有一种方法可以在 JS 中执行此操作，而无需显式地将定义的默认值“Hey”传递给已分配默认值的参数？

原文

I want to create a function with default params, but I want to use one default param and then use a custom value for the following one. For instance,

function greet(name, greeting = 'Hey', question = 'How are you?') {
    console.log(`${greeting}, ${name}! ${question}`);
  }

greet('Jack', , 'You good?'); // tried this, doesn't work :(

What if I wanted to say, "Hey, Jack! You good?", where I use the default for the first param with a default value, but not the second? I have tried calling the function with nothing between the commas in the function call. Is there a way to do this in JS without explicitly passing 'Hey', the defined default value, to the param that has a default already assigned?

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╰ゝ天使的微笑 2025-01-25 19:59:55

function greet(name, greeting = 'Hey', question = 'How are you?') {
    console.log(`${greeting}, ${name}! ${question}`);
  }

greet('Jack',undefined , 'You good?');

function greet(name, greeting = 'Hey', question = 'How are you?') {
    console.log(`${greeting}, ${name}! ${question}`);
  }

greet('Jack',undefined , 'You good?');

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