使用一些现代的javascript和html，您可以执行以下操作。
这是文档：
<template id="resultstemplate"> <option>Ray0</option> <option>Ray1</option> <option>Ray2</option> <option>Ray3</option> <option>Ray01</option> <option>Ray11</option> <option>Ray21</option> <option>Ray31</option> <option>Ray02</option> <option>Ray12</option> <option>Ray22</option> <option>Ray32</option> <option>Ray012</option> <option>Ray112</option> <option>Ray212</option> <option>Ray312</option> <option>Ray03</option> <option>Ray13</option> <option>Ray23</option> <option>Ray33</option> <option>Ray013</option> <option>Ray113</option> <option>Ray213</option> <option>Ray313</option> <option>Ray023</option> <option>Ray123</option> <option>Ray223</option> <option>Ray323</option> <option>Ray0123</option> <option>Ray1123</option> <option>Ray2123</option> <option>Ray3123</option></template><input type="text" name="search" id="search" placeholder="type 'r'" list="searchresults" autocomplete="off" /><datalist id="searchresults"></datalist>
这是js：
var search = document.querySelector('#search');var results = document.querySelector('#searchresults');var templateContent = document.querySelector('#resultstemplate').content;search.addEventListener('keyup', function handler(event) { while (results.children.length) results.removeChild(results.firstChild); var inputVal = new RegExp(search.value.trim(), 'i'); var clonedOptions = templateContent.cloneNode(true); var set = Array.prototype.reduce.call(clonedOptions.children, function searchFilter(frag, el) { if (inputVal.test(el.textContent) && frag.children.length < 5) frag.appendChild(el); return frag; }, document.createdocumentFragment()); results.appendChild(set);});
