满足条件A则执行A的语句，否则执行B语句，python的if...else...功能更加强大，在if和else之间添加数...
$(document).ready(function() { authData=ref.getAuth();if(authData ==null){//TODO find an elegant way to manage authorization// window.location = "../index.html";}else{ ref.child("users").child(authData.uid).on("value",function(snapshot){ $("span.user-name"...
function checkAge(age) { if (age < 18) { const message = "Sorry, you're too young."; } else { const message = "Yay! You're old enough!"; } return message; } console.log(checkAge(21));A: "Sorry, you're too young." B: "Yay! You're old enough!" C: ReferenceError D: ...
0 if(height < 2.45){ console.log("not this time") } else { console.log("new record") } 23rd Mar 2023, 7:08 PM Daniel Answer Often have questions like this? Learn more efficiently, for free: Introduction to Python 7.1M learners Introduction to Java 4.7M learners Introduction to C ...
1 If..else statement not working as expected 1 This 'else if' condition is not working 0 Why javascript IF/ELSE doesn't work properly? Hot Network Questions What do the writings of the NKVD general Lyushkov after his defection to Japan contain? About false hyphenation and \raggedrigh...
import java.awt.Container; import java.awt.FlowLayout; import java.awt.Font; import java.awt....
function checkAge(age) { if (age < 18) { const message = "Sorry, you're too young."; } else { const message = "Yay! You're old enough!"; } return message; } console.log(checkAge(21)); A: "Sorry, you're too young." B: "Yay! You're old enough!" C: ReferenceError D...
function factorial(n) { if (n === 0 || n === 1) { return 1; } else { return n * factorial(n - 1); } } 你可以这样计算 1 到5 的阶乘: jsCopy to Clipboard console.log(factorial(1)); // 1 console.log(factorial(2)); // 2 console.log(factorial(3)); // 6 console.lo...
与其他语言相比,函数的 this 关键字在 JavaScript 中的表现略有不同,此外,在严格模式和非严格模式之间也会有一些差别。
function sum(x) { if (arguments.length == 2) { return arguments[0] + arguments[1]; } else { return function(y) { return x + y; }; } } 在JavaScript中,函数可以提供到 arguments 对象的访问,arguments 对象提供传递到函数的实际参数的访问。这使我们能够使用 length 属性来确定在运行时传递给函...