If 语句忽略数字值

Question

为如此无能而道歉！

let country = "UK";

let language = "English";

let population = 60;

let isIsland = false;

if (language === "English", population < 50, isIsland === false) {

console.log(`You should live in ${country} :)`);

} else {

console.log(`${country} does not meet your criteria`);

}

在这里，无论我将 population 变量设置为什么，它似乎都被 If 语句忽略了，我不确定为什么！

Answer 1

您在 if 语句中缺少逻辑运算符。逻辑运算符用于测试真或假。JavaScript 中有三个逻辑运算符。和（＆＆）或（||）不是（！）let country = "UK";let language = "English";let population = 60;let isIsland = false;if (language === "English" && population < 50 && isIsland === false) {&nbsp; console.log(`You should live in ${country} :)`);} else {&nbsp; console.log(`${country} does not meet your criteria`);}

Answer 2

“或”条件：if&nbsp;(language&nbsp;===&nbsp;"English"&nbsp;||&nbsp;population&nbsp;<&nbsp;50&nbsp;||&nbsp;isIsland&nbsp;===&nbsp;false)“和”条件if&nbsp;(language&nbsp;===&nbsp;"English"&nbsp;&&&nbsp;population&nbsp;<&nbsp;50&nbsp;&&&nbsp;isIsland&nbsp;===&nbsp;false)

Answer 3

您可以为此使用 and (&&) 运算符if (language === "English" && population < 50 && isIsland === false) {console.log(`You should live in ${country} :)`);} else {console.log(`${country} does not meet your criteria`);}