这篇文章主要介绍原生JS如何实现多条件筛选的方法，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
我在学JS初始看到的教程基本都是JS二级联动查询、三级联动查询；如下图：
但有时并不需要级联查询，如购买商品时：
今天我以慕课网前端样式作为参考做了下面的Demo，基于原生JS
<div id="direction">
<strong>方向：</strong>
<span class="active">全部</span>
<span>前端</span>
<span>后台</span>
<span>数据库</span>
<span>UI设计</span>
</div>
<div id="category">
<strong>分类：</strong>
<span class="active">全部</span>
<span>HTML/CSS</span>
<span>JavaScript</span>
<span>jQuery</span>
<span>Python</span>
<span>Java</span>
<span>AngularJS</span>
</div>
<div id="type">
<strong>类型：</strong>
<span class="active">全部</span>
<span>基础</span>
<span>案例</span>
<span>框架</span>
<span>工具</span>
</div>
<strong>返回值：</strong>
<p id="Res"></p>
<style>
span{display: inline-block;
cursor: pointer; padding: 8px; border: 1px solid #999;}
span.active{
background-color: #c14d00;
}
</style><script>
var dSpan = document.getElementById('direction').getElementsByTagName('span');
var cSpan = document.getElementById('category').getElementsByTagName('span');
var tSpan = document.getElementById('type').getElementsByTagName('span');
var aSpan = document.getElementsByTagName('span');
var oDirection = document.getElementById('direction');
var oCategory = document.getElementById('category');
var oType = document.getElementById('type');
var oRes = document.getElementById('Res');
dSpan[0].className = 'active';
cSpan[0].className = 'active';
tSpan[0].className = 'active';
for(var i=0; i<aSpan.length; i++){
aSpan[i].onclick = function(){
var siblings = this.parentNode.children;
for(var j=0; j<siblings.length; j++){
siblings[j].className = '';
}
this.className = 'active';
if(this.parentNode == oDirection || this.parentNode == oCategory || this.parentNode == oType){
returnRes();
}
}
}
function returnRes(){
var o1 = 0, o2 = 0, o3 = 0;
for(var i=0; i<dSpan.length; i++){
if(dSpan[i].className == 'active'){
o1 = i;
}
}
for(var i=0; i<cSpan.length; i++){
if(cSpan[i].className == 'active'){
o2 = i;
}
}
for(var i=0; i<tSpan.length; i++){
if(tSpan[i].className == 'active'){
o3 = i;
}
}
oRes.innerHTML = (dSpan[o1].innerHTML + "," + cSpan[o2].innerHTML + "," + tSpan[o3].innerHTML);
}
</script>最后附上效果图：
注：本篇博文是 【无条件】的分类筛选
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