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<input type ="text"name="name1" id="2">
<input type ="text"name="name1" id="3">
<input type ="text"name="name1" id="4">

window.onload = function(){
    var input3 = document.getElementById('3');
    if(input3.value != ""){
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};

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  //Ò³Ãæ×ªÏò´úÂë
  }
}

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JScript code:

<html xmlns="http://www.w3.org/1999/xhtml">
<head>


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      protected void Page_Load(object sender, EventArgs e)
        {
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