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源代码：
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Fmpq教程(fmpq.com)</title> </head> <body> <p>点击按钮后对数组元素进行四舍五入并计算总和。</p> <button onclick="myFunction()">点我</button> <p>数组元素之和: <span id="demo"></span></p> <script> var numbers = [15.5, 2.3, 1.1, 4.7]; function getSum(total, num) { return total + Math.round(num); } function myFunction(item) { document.getElementById("demo").innerHTML = numbers.reduce(getSum, 0); } </script> </body> </html>
运行结果