<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>点击按钮获取数组中大于 18 的所有元素。</p> <button onclick="myFunction()">点我</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);//[32, 33, 40]
alert(ages); //[32, 33, 16, 40]
} </script> </body> </html>