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js原生获取className&多选一

<!DOCTYPE html><html lang="en"><head>	<meta charset="UTF-8">	<title>js原生获取class名&多取一</title></head><body>	<ul>		<li class="red blue green">111</li>		<li class="red">444</li>		<li class="red blue green">222</li>		<li class="cred blue green">333</li>	</ul>	<script>		function className(classname) {			var tags = document.all ? document.all : document.getElementsByTagName(‘*‘);			var arr = [];			// var reg = /\bclassname\b/g;//普通方式定义			var reg = new RegExp(‘\\b‘+classname+‘\\b‘,‘g‘);//构造函数方式			for (var i = 0; i < tags.length; i++) {				reg.lastIndex = 0;				if (reg.test(tags[i].className)) {					arr.push(tags[i]);				}			}			return arr;		}		var liRed = className(‘red‘);		for (var i = 0; i < liRed.length; i++) {			liRed[i].style.background = ‘green‘;		}	</script></body></html>

  

js原生获取className&多选一