<link type="text/css" rel="stylesheet" href="css/style.css"> <h1>可<span>输入搜索查找自动过滤</span>的下拉列表</h1>
<form>
<input class="chosen-value" type="text" value="" placeholder="输入内容自动过滤">
<ul class="value-list">
<li>阿里巴巴</li>
<li>......</li>
<li>滴滴出行</li>
</ul>
</form> inputField.addEventListener('input', function () {
dropdown.classList.add('open');
var inputValue = inputField.value.toLowerCase();
var valueSubstring = undefined;
if (inputValue.length > 0) {
for (var j = 0; j < valueArray.length; ++j) {
if (valueArray[j].indexOf(inputValue) < 0) {
dropdownItems[j].classList.add('closed');
} else {
dropdownItems[j].classList.remove('closed');
}
var closedNum = document.querySelectorAll('.closed').length;
}
if (closedNum == dropdownItems.length) {
dropdown.classList.remove('open');
}
} else {
for (var i = 0; i < dropdownItems.length; ++i) {
dropdownItems[i].classList.remove('closed');
}
}
}); 
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