使用示例讲述 JavaScript 中的 finally 语句。
无论是否发生错误,finally 语句始终在 try 和 catch 代码块之后执行。
以下是 JavaScript 中 finally 语句的代码 −
示例
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Document</title> <style> body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .result,.sample { font-size: 20px; font-weight: 500; } </style> </head> <body> <h1>Finally in Javascript</h1> <div class="sample"></div> <div style="color: green;" class="result"></div> <button class="Btn">CLICK HERE</button> <h3> Click on the above button to call a variable before it is defined </h3> <script> let sampleEle = document.querySelector(".sample"); let resEle = document.querySelector(".result"); document.querySelector(".Btn").addEventListener("click", () => { try { resEle.innerHTML = a; } catch (err) { resEle.innerHTML = "Error = " + err; } finally { sampleEle.innerHTML = "The code inside finally has been executed"; } let a = 44; }); </script> </body> </html>
输出
以上代码会产生以下输出 −
单击“单击此处”按钮后 −
广告