JavaScript if...else StatementIn computer programming, the if...else statement is a conditional statement that executes a block of code only when a specific condition is met. For example,Suppose we need to assign different grades to students based on their scores....
JavaScript if...else ❮PreviousJavaScriptStatementsNext❯ Example If the hour is less than 20, output "Good day": lethour =newDate().getHours(); if(hour <20) { document.getElementById("demo").innerHTML="Good day"; } Try it Yourself »...
// JavaScript代码示例letinput='B';if(input==='A'){console.log('处理条件A');}elseif(input==='B'){console.log('处理条件B');}elseif(input==='C'){console.log('处理条件C');}else{console.log('处理其他情况');} 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 对于Python或Bas...
在JavaScript中,IF和ELSE IF有多种用途,它们可以用于条件判断和逻辑运算。 1. 单条件判断 ```javascript if (condition) { // 当条件为真时执...
} else { block of code to be executed if the condition1 is false and condition2 is false }Example If time is less than 10:00, create a "Good morning" greeting, if not, but time is less than 20:00, create a "Good day" greeting, otherwise a "Good evening": if (time < 10) {...
javascript 条件 if javascript if语句 javascript if语句 语法 if (condition) statement1 [else statement2] 1. 2. 3. 4. condition 值为真或假的表达式 statement1 当condition为真时执行的语句。可为任意语句,包括更深层的内部if语句。要执行多条语句,使用块语句({ … })将这些语句分组;若不想执行语句,...
<!-- /* *** Example if ...else and conditional operator*** */ var d = new Date(); var time= d.getHours(); if (time < 10) { document.write("Goodmorning"); } else document.write"Good day"); } //--> /script If youruntheabove it should...
在 JavaScript 文件中,我们可以使用各种方式来初始化数据项,例如从服务器获取数据、从本地缓存获取数据、从用户输入获取数据等等。通过使用 wx:if 和 wx:else 标签,我们可以方便地实现条件判断的 else 分支,从而增强小程序的可用性和交互性。3、wx:for 循环 WXML 模板中,可以使用 wx:for 列表渲染标签,实现...
JavaScript var isRaining = false; if (isRaining) { alert("Don't forget an umbrella!"); } else { alert("No need for an umbrella."); } Live Example The moment we run the code, we get the second alert, just as we expected. Also notice the body of else. Just like that of if,...
很多业务系统开发中,不可避免的会出现状态变化,通常采用的情形可能是使用工作流去完成,但是对于简单场景下,用工作流有点大财小用感觉,比如订单业务中,订单状态的变更,涉及到的状态量不是很多,即使通过简单的if-else也能足够使用,甚至是用上switch去减少if-else的使用,都是可以的,尽管这会丧失某些东西。为更好的优...