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<!doctype html><html><head><meta charset="utf-8"><meta charset="utf-8"><title>通過class擷取元素</title><style>#box div { width:100px; height:100px; border:1px solid red; margin:10px; }#box .bar { background:#ccc; }</style><script>window.onload=function (){ var oDiv=document.getElementById(‘box‘); var arr=getByClass(oDiv, ‘bar‘); alert(arr.length);};function getByClass(oParent, sClassName){ var res=[]; var aTmp=oParent.getElementsByTagName(‘*‘); for (var i=0; i<aTmp.length; i++) { if (aTmp[i].className.indexOf(sClassName) != -1)
{ res.push(aTmp[i]); } } return res;}</script></head><body> <div id="box"> <div class="bar item"></div> <div class="bar"></div> <div class="bar"></div> <div></div> <div></div> <p class="bar"></p> </div></body></html>
js通過class擷取元素
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