js拼接字符串

//最外层以单引号开始

'<a href="javascript:;" onclick="preview(\''+row.fileName+'\')";>查看|</a><a href="a/sys/caseAttachment/downloadByName?fileName='+ row.fileName +'">下载</a>';

//最外层以双引号开始

 html+="<td><a href='javascript:void(0)' onclick='online(\""+review.fileName+"\")'>查看</a>|<a href='a/sys/caseAttachment/downloadByName?fileName='"+review.fileName+">下载</a></td>";