if/else 语句是 JavaScript 的"条件"语句的一部分,用于根据不同的条件执行不同的操作。在JavaScript 中,我们有以下条件语句:使用if 指定要执行的代码块,如果指定条件为真 使用else 指定要执行的代码块,如果相同条件为假 如果第一个条件为假,则使用 else if 指定要测试的新条件 使用switch 选择要执行的多个代
}elseif(time <20) { greeting ="Good day"; }else{ greeting ="Good evening"; } The result of greeting will be: Good morning Try it Yourself » Example This example will write a link to either W3Schools or to the World Wildlife Foundation (WWF). By using a random number, there is...
} else if (time < 20) { greeting = "Good day"; } else { greeting = "Good evening"; } The result of greeting will be: Good morning Try it yourself » More ExamplesRandom link This example will write a link to either W3Schools or to the World Wildlife Foundation (WWF). By us...
Please see this example: https://www.w3schools.com/js/js_validation.asp 15th Aug 2021, 2:57 PM JaScript + 2 Priyanka___Priya__ u can use event.preventDefault(); to prevent while submission U can review the code i have edited right now And do same with form 1 15th Aug 2021, 3:...
Use else to specify a block of code to be executed, if the same condition is false Use else if to specify a new condition to test, if the first condition is false Use switch to specify many alternative blocks of code to be executedThe...
if (条件) { // 条件为真时执行的代码 } else if (其他条件) { // 其他条件为真时执行的代码 } else { // 所有条件都不满足时执行的代码 } 应用场景 根据用户的输入显示不同的信息。 在游戏开发中根据玩家的状态改变游戏逻辑。 在数据处理中根据数据的不同属性执行不同的操作。 正则表达式的 test 方法...
I want to understand why the (else if) statement is not executed when (buy =false) i. E assigned false. var buy = prompt("place your order","order"); x= buy; if(buy=true){alert("thanks for ordering a " + x);} else if(buy=...
readonly = true; } else { this.getField("T2").readonly = false; this.getField("T3").readonly = false; } The problem I'm noticing is, that as soon as I fill text into T1 and then delete it afterwards, the script still treats it as if there is some content in T1. So, I...
overhead of an external library. Plus for smaller apps, I'm too lazy to set up the external library 😂. But if your app already has an external library installed, then go ahead and use it. You will know your app better than anyone else. So choose what works best for your situation...
fmt.Println("dayu10") }else if a<10{ fmt.Println("xiaoyu10"); }else { fmt....