<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>document.getElementsByClassName在ie8及其以下的兼容性问题</title>
</head>
<body>
<div id="info" class="longzhoufeng"></div>
<script type="text/javascript">
//原生js方法document.getElementsByClassName在ie8及其以下的兼容性问题
function getClassNames(classStr, tagName) {
if(document.getElementsByClassName) {
return document.getElementsByClassName(classStr)
} else {
var nodes = document.getElementsByTagName(tagName), ret = [];
for(i = 0; i < nodes.length; i++) {
if(hasClass(nodes[i], classStr)) {
ret.push(nodes[i])
}
}
return ret;
}
}
function hasClass(tagStr, classStr) {
var arr = tagStr.className.split(/\s+/); //这个正则表达式是因为class可以有多个,判断是否包含
for(var i = 0; i < arr.length; i++) {
if(arr[i] == classStr) {
return true;
}
}
return false;
}
var aaa = getClassNames('longzhoufeng', 'div');
alert(aaa[0].id)
alert(aaa[0].className)
// console.log(aaa)
</script>
</body>
</html>getElementsByClassName在ie8及其以下的兼容性问题
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转载自blog.csdn.net/longzhoufeng/article/details/80689039
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