完整版getByClass2016/4/20

function getByclass(parent,sclass)
	{
		var re=new RegExp('\\b'+sclass+'\\b','i')
		var aEli=parent.getElementsByTagName('*');
		var arr=[];
		
		for(var i=0;i<aEli.length;i++)
		{
			if(re.test(aEli[i].className))
			{
				arr.push(aEli[i]);
				 
			}
			
		}
		return arr;
	}