jQuery : 判斷html text不可空白 (check html input tag value not null)

html

<form id="FROMTAG" name="form1" method="post">
<input type="text">

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JavaScript

$("#FROMTAG").find(':input').each(function()
{
var ty = this.type;
var val = $(this).val();

if(ty=="text" && val=="")
{
alert("欄位不可空白");
return false;
}
});