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function add1()
{
var obtn=document.createElement("input");
obtn.setAttribute("type","button");
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function add2()
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var obtn=document.createElement("input");
obtn.type="button";
obtn.value="test2";
document.body.appendChild(obtn);
}
function add3()
{
var obtn="<input type='button' value='test3'/>";
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<body>
<input type="button" value="add1" onclick="add1()"/>
<input type="button" value="add2" onclick="add2()"/>
<input type="button" value="add3" onclick="add3()"/>
</body>
</html>
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