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<!DOCTYPE html> <html> <body> <p>单击该按钮可获取数组中值为 18 或更大的每个元素。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> var ages = [32, 33, 16, 40]; function checkAdult(age) { return age >= 18; } function myFunction() { document.getElementById("demo").innerHTML = ages.filter(checkAdult); } </script> </body> </html>