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