​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>JavaScript 数组</h1>
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<p>将每个元素的值乘以 10：</p>
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<p id="demo"></p>
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<script>
const numbers = [65, 44, 12, 4];
numbers.forEach(myFunction)
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document.getElementById("demo").innerHTML = numbers;
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function myFunction(item, index, arr) {
  arr[index] = item * 10;
}
</script>
​
</body>
</html>
​