<input name="TextBox2" type="text" id="TextBox2">
<script language="JavaScript">
function check(objname){
var obj=document.getElementById(objname);
if(obj)alert(objname+"已經存在");
else alert(objname+"不存在");
}
check("TextBox1");
check("TextBox2");
</script>
<script language="JavaScript">
function check(objname){
var obj=document.getElementById(objname);
if(obj)alert(objname+"已經存在");
else alert(objname+"不存在");
}
check("TextBox1");
check("TextBox2");
</script>
没啥好说的啦
<script language="JavaScript">
function check(objname){
var obj=document.getElementById(objname);
if(obj)alert(objname+"已經存在");
else alert(objname+"不存在");
}
check("TextBox1");
check("TextBox2");
</script>
function checkobj(objname){
var obj=document.getelementbyname(objname);
if(obj!=null)alert(objname+"已經存在");
else alert(objname+"不存在");
}</script>