<input type="text" id="tb_Test" />
<input type="button" id="btn_Test" value="Button />var type = document.getElementById("tb_Test").type;
if(type == "text"){
alert("it is input box.");
}
if(type == "button"){
alert("it is button.");
}
<input type="button" id="btn_Test" value="Button />var type = document.getElementById("tb_Test").type;
if(type == "text"){
alert("it is input box.");
}
if(type == "button"){
alert("it is button.");
}
<select id="select"><option>1</option></select>
<script type="text/javascript">
var txt=document.getElementById("txt");
var select=document.getElementById("select");
alert(txt.type);
alert(select.type);得到结果你自己看看就知道了
<input id="tt"/>
<select id="select1" onchange="chengSelect()">
<option value="1">test </option>
<option value="2">test1 </option>
<option value="3">test2 </option>
</select>
<script>
var input = document.getElementById("tt");
var select1 = document.getElementById("select1");
alert(input.tagName);
alert(select1.tagName);
</script>
alert(obj.type);
}