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<!DOCTYPE html> <html> <body> <h1>JavaScript 数组</h1> <p>计算数组中值的总和：</p> <p id="demo"></p> <script> let sum = 0; const numbers = [65, 44, 12, 4]; numbers.forEach(myFunction); document.getElementById("demo").innerHTML = sum; function myFunction(item) { sum += item; } </script> </body> </html>