javascript 怎样把拼接起来的<tr><td></td></tr>插入到一个table,

function addcolumns(selecedAllColumns){
var showContentObj=document.getElementById("selectedTableStructShowDiv");
innerHTML.document.getElementById("allColumnsTab");

var userTableStr='';
userTableStr +='<table width="750" height="33" border="1">';
userTableStr += '<tr>';
userTableStr += '<td width="100"><input type="text" size ="11" value=""/></td>';
userTableStr += '<td width="100"><input type="text" value="" size ="11"/></td>';
userTableStr += '<td width="90"><input type="text" value="" size ="8"/></td>';
userTableStr += '<td width="390"><select name="tableColumnsName" id="tableColumnsName" onchange="setDataTypeLength()">';
userTableStr += '<option>--请选择--</option>';
for(var j=0;j<selecedAllColumns.length;j++)
{
var objcolumns = selecedAllColumns[j].columnName+","+selecedAllColumns[j].dataType+","+selecedAllColumns[j].dataLength;
    userTableStr += '<option value="'+objcolumns+'">'+selecedAllColumns[j].columnName+'</option>';
}
userTableStr +='</select></td>';
userTableStr += '<td width="60"><input type="text" value=""/></td>';
userTableStr += '<td width="20"><input type="text" value="" size ="3"/></td>';
userTableStr += '<td width="93"><input id="primaryKey" type="radio" /></td>';
userTableStr += '<td width="93"><input id="defaultValue" type="text" value="" size ="20" /></td>';
userTableStr += '</tr>';
userTableStr +='</table>';


showContentObj.innerHTML=showContentObj.innerHTML+userTableStr;

}
插入到下面的表中要怎么实现
/***

• project:uum
• author:yangjianting
• description:显示所有数据列表的字段信息

• updatetime:上午01:11:41
  */
  function showSelectTablePage(selecedAllColumns,selectedAllSourceColumns,tableName,sourceTableName,dataSourceTableId)
  {
  var showContentObj=document.getElementById("selectedTableStructShowDiv");
  var userTableStr='';
  userTableStr +='

  ';

  userTableStr += '

  ';
  userTableStr += '';
  userTableStr += '';
  userTableStr += '';
  userTableStr += '';

  userTableStr += '

  ';
  userTableStr +='

  '+sourceTableName+'

  '+tableName+'

  是否主键

  默认值

  ';

  userTableStr +='

  ';
  for(var i=0;i {
  userTableStr += '';
  userTableStr += '';
  userTableStr += '';
  userTableStr += '';
  userTableStr += '';
  userTableStr += '';
  userTableStr += '';
  userTableStr += '';
  userTableStr += '';
  userTableStr += '';
  }

  userTableStr +='

  '+selectedAllSourceColumns[i].columnName+'

  '+selectedAllSourceColumns[i].dataType+'

  '+selectedAllSourceColumns[i].dataLength+'

  '; userTableStr += '--请选择--'; for(var j=0;j { var objcolumns = selecedAllColumns[j].columnName+","+selecedAllColumns[j].dataType+","+selecedAllColumns[j].dataLength; userTableStr += ''+selecedAllColumns[j].columnName+''; } userTableStr +='

  ';

  showContentObj.innerHTML="";
  showContentObj.innerHTML=userTableStr;
  }

你写的没看明白，
不过你网上收下dom 操作 表格 很多例子 就清楚了

你拼接的时候不要拼接table标签，例如这样

html部分:

js部分:
str="test";
//js循环部分
for(var i=0;i str+=""+i+"";
}
//最后dom操作，将拼接好得字符串，写入到table里
$(".intable").html(str);