拼接html

var html='<tbody>\
<tr class="print-tr-top">\
<td width="50%" colspan="3">\
<p>发货方:'+a+'</p>\
<p>发货地址:'+b+'</p>\
</td>\
</tr>\
<tr class="print-tr-top">\
<td width="50%" colspan="3">\
<p>发货方:'+a+'</p>\
<p>发货地址:'+b+'</p>\
</td>\
</tr>\
</tbody>';

document.getElementById('aa').innerHTML=html