Result Size: 625 x 534
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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>