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<!DOCTYPE html> <html> <body> <p>单击该按钮可返回数组中第一个值大于特定数字的元素的索引。</p> <p>最低年龄：<input type="number" id="ageToCheck" value="18"></p> <button onclick="myFunction()">试一试</button> <p>Index: <span id="demo"></span></p> <p><strong>注意：</strong> IE 11（及更早版本）不支持 findIndex() 方法。</p> <script> var ages = [4, 12, 16, 20]; function checkAdult(age) { return age >= document.getElementById("ageToCheck").value; } function myFunction() { document.getElementById("demo").innerHTML = ages.findIndex(checkAdult); } </script> </body> </html>