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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript Array.filter()</h1>
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<p>使用通过测试的所有数组元素创建一个新数组。</p>
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<p id="demo"></p>
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<script>
var numbers = [45, 4, 9, 16, 25];
var over18 = numbers.filter(myFunction);
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document.getElementById("demo").innerHTML = over18;
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function myFunction(value, index, array) {
  return value > 18;
}
</script>
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</body>
</html>
​