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<!DOCTYPE html> <html> <body> <h1>Array keys()</h1> <p>从 fruit 数组创建一个迭代对象。</p> <p>迭代对象将包含数组的键：</p> <p id="demo"></p> <p><strong>注意：</strong> IE 11（及更早版本）不支持 keys 方法。</p> <script> var fruits = ["香蕉","橙子","苹果","芒果"]; var fk = fruits.keys(); for (x of fk) { document.getElementById("demo").innerHTML += x + "<br>"; } </script> </body> </html>