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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 数组</h1>
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<p>单击按钮可获取数组中值高于此数字的每个元素。</p>
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<p><input type="number" id="ageToCheck" value="18"></p>
<button onclick="myFunction()">试一试</button>
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<p id="demo"></p>
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<script>
const ages = [32, 33, 12, 40];
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function checkAge(age) {
  return age > document.getElementById("ageToCheck").value;
}
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function myFunction() {
  document.getElementById("demo").innerHTML = ages.filter(checkAge);
}
</script>
​
</body>
</html>
​