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);
});
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