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<!DOCTYPE html> <html> <body> <h2>JavaScript 函数</h2> <p>全局函数 (myFunction) 返回参数 (a,b) 的乘积：</p> <p id="demo"></p> <script> function myFunction(a, b) { return a * b; } document.getElementById("demo").innerHTML = myFunction(10, 2); </script> </body> </html>