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<!DOCTYPE html> <html> <body> <h3>如何访问 DATALIST 元素的演示</h3> <form> <input list="myDatalist"> <datalist id="myDatalist"> <option value="Internet Explorer"> <option value="Firefox"> <option value="Chrome"> <option value="Opera"> <option value="Safari"> </datalist> </form> <p>单击该按钮可获取数据列表中选项元素的数量。</p> <button onclick="myFunction()">试一试</button> <p><strong>注意：</strong> input 元素的 list 属性用于将它与 datalist 元素绑定在一起。</p> <p><strong>注意：</strong> Internet Explorer 9 及更早版本或 Safari 不支持 datalist 元素。</p> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myDatalist").options.length; document.getElementById("demo").innerHTML = "Found " + x + " options in the list."; } </script> </body> </html>