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function add()
{
  var div1=document.getElementById("filelist");
   
    var  filea=document.createElement("input");
  filea.setAttribute("type","file");
  filea.setAttribute("size","40");
  filea.setAttribute("name","file5");
  filea.setAttribute("class","aa");
}
<input type='button' value="Ôö¼Ó" onclick="add()">
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document.getElementByTagname("input")
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var x=document.getElementsByTagName("input");
  alert(x.length);


function getElements()
  {
  var x=document.getElementsByTagName("input");
  alert(x.length);
  }

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jq: $("input").size();

document.getElementsByTagName("input");

var inputs=document.getElementsByTagName("input");
var len=inputs.length

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$("input").size(); jqueryÖÐʵÏÖ

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