主页
JavaScript
JavaScript 函数闭包
tryjs_function_closures5
运行 ❯
×
更改方向
保存代码
更改主题
<!DOCTYPE html> <html> <body> <h2>JavaScript 闭包</h2> <p>用局部变量计数。</p> <button type="button" onclick="myFunction()">Count!</button> <p id="demo">0</p> <script> var add = (function () { var counter = 0; return function () {counter += 1; return counter;} })(); function myFunction(){ document.getElementById("demo").innerHTML = add(); } </script> </body> </html>