Question

js如何获取固定id下的相同class的长度？求大神指教

代码如下，如何获取固定id下的相同class的长度？应该用原生js怎么写啊？
<div id="sss">
<div class="a">qq</div>
<div class="a">qq</div>
<div class="a">qq</div>
<div class="a">qq</div>
<div class="a">qq</div>
<div class="a">qq</div>
<div class="a">qq</div>
<div class="a">qq</div>
</div>

Answer 1

var pdiv = document.getElementById("sss");
var childs = pdiv.children;
var classCount = 0;
for(var i = 0 ; i< childs.length; i++){
if(childs[i].className == 'a'){
classCount ++;
}
}
alert(classCount);