主页
JavaScript
JavaScript 逻辑运算符
tryjs_nullish
运行 ❯
×
更改方向
保存代码
更改主题
<!DOCTYPE html> <html> <body> <h1>JavaScript Operators</h1> <h2>The ?? Operator</h2> <p>The ?? operator returns the right operand when the left operand is nullish (null or undefined), otherwise it returns the left operand.</p> <p id="demo"></p> <script> let name = null; let text = "missing"; let result = name ?? text; document.getElementById("demo").innerHTML = "The name is " + result; </script> </body> </html>