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<!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> // 增加计数器的函数 function add() { var counter = 0; counter += 1; return counter; } // Trying to increment the counter function myFunction(){ document.getElementById("demo").innerHTML = add(); } </script> </body> </html>