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<!DOCTYPE html> <html> <body> <p>单击该按钮以从右到左减去数组中的数字得到总和。</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 = [2, 45, 30, 100]; function getSum(total, num) { return total - num; } function myFunction(item) { document.getElementById("demo").innerHTML = numbers.reduceRight(getSum); } </script> </body> </html>