}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 ...
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...
letisOnline =true;// if else statement.if(isOnline){console.log("He is Online.");}else{console.log("He is Offline.");}//He is Online //Same example using the ternary operator[condition] ? [if] : [else]isOnline ?console.log("...
The void OperatorThe void operator evaluates an expression and returns undefined. This operator is often used to obtain the undefined primitive value, using "void(0)" (useful when evaluating an expression without using the return value).Example Useless link Click me to change the background co...
Please, pay attention that if-else approach lacks returning value currently, whereas ternary operator does return the value of the last operator executed (this may affect the overall value of boolean expression in parentheses). Share Improve this answer Follow edited Jan 18, 2012 at 21:29 ans...
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...
}else{returnfalse; } });// goodinbox.filter((msg) =>{const{ subject, author } = msg;if(subject ==='Mockingbird') {returnauthor ==='Harper Lee'; }returnfalse; }); 4.7如果数组有多行,则在开始的时候换行,然后在结束的时候换行。
JavaScript provides a special operator called ternary operator :? that assigns a value to a variable based on some condition. This is the short form of the if else condition. Syntax: <condition> ? <value1> : <value2>; The ternary operator starts with conditional expression followed by the ...
Learn the basics of the JavaScript Ternary OperatorThe 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>...
A ternary operator is a three-operand operator that is supported in most programming languages, including JavaScript, Java, C++, C#, and many others. It is also referred to as a conditional operator because it is considered to be a more concise alternative to the conditional (if-else) stateme...