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<!DOCTYPE html> <html> <body> <p>单击按钮以获取数组中四舍五入数字的总和。</p> <button onclick="myFunction()">试一试</button> <p>数组中数字的总和：<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>