在 JavaScript 中将函数传递为回调
下面是在 Javascript 中将函数传递为回调的代码:-
范例
<!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 { font-size: 20px; font-weight: 500; color: blueviolet; } </style> </head> <body> <h1>Passing a function as a callback</h1> <div class="result"></div> <button class="Btn">CLICK HERE</button> <h3>Click on the above button to pass the add2() function as callback to multiply9() function</h3> <script> let resEle = document.querySelector(".result"); function add2(a) { return a + 2; } function multiply9(fn, num) { return fn(num) * 9; } document.querySelector(".Btn").addEventListener("click", () => { resEle.innerHTML = "The number returned = " + multiply9(add2, 12); }); </script> </body> </html>
输出
单击“点这里”按钮时 -
广告