点击运行
<!DOCTYPE html> <html> <body> <h1>JavaScript 函数闭包</h1> <p>使用局部变量计数。</p> <p id="demo">0</p> <script> document.getElementById("demo").innerHTML = add(); function add() { var counter = 0; function plus() {counter += 1;} plus(); return counter; } </script> </body> </html>
运行结果
