Test Fiddle
HTML
<ls>
<data id="1">Data1</data>
<data id="2">Data2</data>
<data id="3">Data1</data>
</ls>
JavaScript
alert(document.getElementById('1').innerHTML)
<ls>
<data id="1">Data1</data>
<data id="2">Data2</data>
<data id="3">Data1</data>
</ls>
alert(document.getElementById('1').innerHTML)