我是JavaScript的初学者,我试图在if/else语句中调用字符串数组。这就是我拥有的。它可以正常工作,但是执行此操作的方法较短。我不想使用任何其他方法。我只想坚持如果/else语句。 在这里输入代码 var welcomeMessage = prompt("what is your name?").toLowerCase(); var names = ["b
下面的else-yegation即使if-stalal是假的,也不会执行。我想我已经做出了一些非常基本的错误,但无法弄清楚什么。 var a = ["king","queen","100"]; for (var i=0; i<a.length; i++) { if (a[i] === "king" || "queen"){ console.log("monarch"); } else { console.log("The number ...
这个循环类型可以通过组合 loop、if、else 和 break 来实现;如果你喜欢的话,现在就可以在程序中试试。 示例 : 使用了 while:程序循环三次,每次数字都减一。接着,在循环结束后,打印出另一个信息并退出。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 fnmain(){letmut number=3;whilenumber!=0{println...
带有多次重复的if else语句内的Applescript if else语句 、、、 "document.readyState" in document 1) is "complete" then else-- not sure if this second else is needed, why not just wait until the first access hasnew hyperlink of cell ("K" & r) with properties {address:t 浏览2提问于2014...
JavaScript Example of if else if: In this tutorial, we will learn how if else if works in JavaScript? Here, we are writing a JavaScript example to demonstrate the use and working of if else if in JavaScript.
javascriptifelse不出来 javascriptforeach s中那么多循环,for for…in for…of forEach,有些循环感觉上是大同小异今天我们讨论下for循环和forEach的差异。 我们从几个维度展开讨论: for循环和forEach的本质区别。 for循环和forEach的语法区别。 for循环和forEach的性能区别。
JavaScript else StatementWe use the else keyword to execute code when the condition specified in the preceding if statement evaluates to false.The syntax of the else statement is:if (condition) { // block of code // execute this if condition is true } else { // block of code // ...
In the above example, the else block will be executed. Remember: else cannot include any condition and it must follow if or else if conditions. else if The else if statement can be used after the if statement. Example: else if Copy let x: number = 10, y = 20; if (x > y)...
If you have more than two custom messages, you could use the Else If extension to solve this programming problem.JavaScript Code: <!-- var visitor = "principal"; if(visitor == "teacher"){ document.write("My dog ate my homework..."); }else if(visitor == "principal"){ document.wri...
Else is Optional:Theelseblock is not mandatory; anifstatement can exist without anelse. Else Without If is Invalid:Theelsestatement must always be associated with a precedingifstatement. Nested if-else Allowed:You can place aniforelse ifstatement inside anotherifstatement (nested if-else). ...