JavaScript函数传入实参多于形参时返回NaN原因咨询

• 自定义函数percetageofworld3仅声明了1个形参population1，调用时传入的多出来的实参不会被函数接收，会被直接丢弃
• 你调用该函数时第一个入参传的是字符串类型的国家名country，字符串做除法运算会隐式转换为NaN，最终所有计算结果都为NaN

只需要调整percetageofworld3的入参为人口数值即可，修复后代码如下：

function percetageofworld3(population1) {
    return (population1 / 7900) * 100;
}
const describePopulation = function(country, population) {
    // 仅传入人口数值作为参数即可
    const chinesePopulation = percetageofworld3(population);
    console.log(chinesePopulation)
    const countries = `${country} has ${population} million people,
        which is about ${chinesePopulation}% of the world`
    return countries;
}

内容的提问来源于stack exchange，提问作者Osama Shaikh