JavaScript怎么取得当前form对象

Question

document.forms.length
for(var i=0; i<document.forms.length; i++)
    //document.forms[i]  //得到表单对象

Answer 1

<form name=meizz>
<input type=button value=ok onclick="alert(this.form.name)">
</form>

Answer 2

<form name=meizz>
<input type=button value=ok onclick="for(var i=0; i<document.forms.length; i++){if(document.forms[i]==this){alert('form['+i+']')}">
</form>

Answer 3

<script>
function exac(obj)
{
//
alert(obj.name);
}
</script><form name= kenshin>
<input type=button value=ok onclick="exac(this.form)">
</form>