var trhtml = '';
trhtml += '<tr>\n';
trhtml += ' <td>' + dr.UserId + '</td>\n';
trhtml += ' <td>' + dr.Name + '</td>\n';
trhtml += ' <td>' + dr.PhoneNumber + '</td>\n';
trhtml += ' <td>' + dr.LmUserId + '</td>\n';
trhtml += ' <td>' + dr.CarsSource + '</td>\n';
trhtml += ' <td>' + dr.PhoneNumFriend + '</td>\n';
trhtml += ' <td>' + dr.Language + '</td>\n';
trhtml += ' </td>';
trhtml += ' <td>';
trhtml += '<a class="button border-black button-little icon_xyui_edit" href="javascript:MasterDataEdit(\'' + dr.ID + '\',\'' + dr.Language + '\')"> 编辑</a> ';
trhtml += ' </td>';
trhtml += '</tr>';
return trhtml;
trhtml += ' <td>' + dr.Language === 0?'中文':dr.Language === 1?'英文':dr.Language + '</td>\n';
再有你可以用模板字符串 这样你就不需要 += 了
三目 运算 或者 if判断