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Datalist options 集合
tryjsref_datalist_options_length
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<!DOCTYPE html> <html> <body> <form> <input list="browsers" name="browser"> <datalist id="browsers"> <option value="Internet Explorer"> <option value="Firefox"> <option value="Chrome"> <option value="Opera"> <option value="Safari"> </datalist> </form> <p>Click the button to display the number of option elements in the datalist.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("browsers").options.length; document.getElementById("demo").innerHTML = "Found " + x + " options in the list."; } </script> </body> </html>