当我发送更多参数然后函数参数时，函数返回 Nan 返回答案

【问题标题】：Function returns Nan returns when I send More argument then function parameters当我发送更多参数然后函数参数时，函数返回 Nan 返回
【发布时间】：2021-11-22 02:18:07
【问题描述】：

我不明白为什么当我传递的参数多于参数时它会发送 nan

function percetageofworld3(population1) {
    return (population1 / 7900) * 100;
}
const describePopulation = function(country, population) {
    const chinesePopulation = percetageofworld3(country, population);
    console.log(chinesePopulation)
    const countries = `${country} has ${population} million people,
        which is about ${chinesePopulation}% of the world`
    return countries;
}

【问题讨论】：

country 长什么样子？
因为你正在做一个字符串/数字运算，它给出了 NaN。将人口传递到世界百分比3

标签： javascript function javascript-objects

【解决方案1】：

你传递给percetageofworld3 两个参数，但函数只有一个，所以你传递国家例如'italy'，它将是return ('italy' / 7900) * 100;

如果你只通过数字工作

function percetageofworld3(population1) {
  return (population1 / 7900) * 100;
}
const describePopulation = function(country, population) {
  const chinesePopulation = percetageofworld3(population);
  console.log('Result of chinesePopulation: ' + chinesePopulation)
  const countries = `${country} has ${population} million people,
which is about ${chinesePopulation}% of the world`
  return countries;
}
console.log('Result of describePopulation: ' + describePopulation('italy', 1000))

【讨论】：