}elseif(userInput == 3) { monthName= "March"; }else{ monthName= "Unknown month number"} alert(monthName); ternary operator基于多个条件的例子:在以下的例子中,if-else-if语句会被ternary operator所取代 varuserInput = Number(prompt("Please enter a month number - 1, 2 or 3"));varmonthName = userInput == 1 ? "January" : userInput ...
A ternary operator can be used to replace anif..elsestatement in certain situations. Before you learn about ternary operators, be sure to check theJavaScript if...else tutorial. What is a Ternary operator? A ternary operator evaluates a condition and executes a block of code based on the co...
The ternary operator is the only operator in JavaScript that works with 3 operands, and it’s a short way to express conditionals.This is how it looks:<condition> ? <expression> : <expression>The condition <condition> is evaluated as a boolean, and upon the result, the operator runs the...
In JavaScript, the ternary operator also allows conditional chains where the right-side condition chains into another ternary operator. By chaining ternary operators, you effectively write an “if ...else if ... else” conditional chain. But, of course, you have to be careful that chaining the...
Keep It Simple: Use the ternary operator for simple conditions. If your logic is complex, consider using if...else statements for better readability. Avoid Nesting: While nesting is possible, excessive nesting can lead to confusion. Aim for clarity in your code. Use Parentheses: When using the...
条件(三元)运算符是JavaScript 唯一使用三个操作数的运算符:一个条件后跟一个问号(?),如果条件为真值,则执行冒号(:)前的表达式;若条件为假值,则执行最后的表达式。该运算符经常当作 if...else 语句的简捷形式来使用。 尝试一下语法 jsCopy to Clipboard condition ? exprIfTrue : exprIfFalse 参数 condition...
20-Ternary Operator This is a good code protection program when you only want to write the if..else // Longhand const age = 18; let greetings; if (age < 18) { greetings = 'You are not old enough'; } else { greetings = 'You are young!'; } // Shorthand const greetings = age...
//Same example using the ternary operator[condition] ? [if] : [else]isOnline ?console.log("He is Online.") :console.log("He is Offline.");//He is Online 如你所见,三元运算符可以轻松的仅用一行代码编写条件语句。它在小条件下非常有用...
This is the short form of the if else condition. Syntax: <condition> ? <value1> : <value2>; The ternary operator starts with conditional expression followed by the ? operator. The second part (after ? and before :) will be executed if the condition turns out to be true. Suppose, ...
Conditional (Ternary) OperatorJavaScript also contains a conditional operator that assigns a value to a variable based on some condition.Syntaxvariablename = (condition) ? value1:value2 Examplelet voteable = (age < 18) ? "Too young":"Old enough"; Try it Yourself » If the variable age...