超简单的面试题，不会做，请各位帮忙! - 调试易

超简单的面试题，不会做，请各位帮忙!

<form mothed="post" onSubmit="return alertClick()">
<input type=text id="textbox1">
<input type="submit" value="Submit" name="Submit">
</form>

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<script language="javascript">
function alertClick()
{
  varA=document.all("textbox1");
  if(varA.value=="")
   {
     alert("不能为空!");
     varA.focus;
     return false;
   }
  else

     return true;

}
</script>
<input type=text id="textbox1">
<input type="submit" value="Submit" name="Submit" onclick="alertClick()">
<html><head>
<script language="javascript">
<!--
function check(){
var x=document.form1.name1.value;
if(x=="")
{
alert("不能为空")
form1.name1.focus();
return false;
}
else
{
return ture;
}
}
</script></head><body>
<form name="form1" action="" method="post" >
<input type="text" name="name1"><br>
<input type="submit" value="提交" onMousedown="return check()"></form></body></html>
<script language="javascript">
function alertClick()
{
  varA=document.all("textbox1");
  if(varA.value=="")
   {
     alert("不能为空!");
     varA.focus;
     return false;
   }
  else

     return true;

}
</script><form mothed="post" onSubmit="return alertClick()">
<input type=text id="textbox1">
<input type="submit" value="Submit" name="Submit">
</form>
onSubmit="return alertClick()"