问一个初学者性有关问题

2012-03-06

问一个菜鸟性问题htmlheadtitleEarnest Bank Web/titlescript languageJavaScriptfunction s

问一个菜鸟性问题
<html>
<head>
<title>Earnest Bank Web</title>
<script language="JavaScript">
function show()
{
var useID=i.value;
var usep=p.value;

var IDlength=useID.length;
var PWlength=usep.length;
if(IDlength>=8){
alert("ID不超过8个字符");
i.fouse();
}
else if(PWlength!=5)
{
alert("密码不能超过5个字符");
p.fouse();
}
}
</script>
</head>
<body>
<h1 align=center>Earnest Bank</h1>
<table align=center>
<caption>登录</caption>
<tr><td>ID</td><td><input type=text name=i></td></tr>
<tr><td>password</td><td><input type=password name=p></td></tr>
<tr align=center><td colspan=2><input type=button value="确定" onClick="show()"></td></tr>

当我把上面的大于号改为=号时，可以弹出，如果不改就弹不出来请问这是怎么会事

[解决办法]

HTML code

html><head><title>Earnest   Bank   Web</title><script  type="text/javascript" language= "JavaScript"> function   show() { var   useID=i.value; var   usep=p.value; var   IDlength=useID.length; var   PWlength=usep.length; if(IDlength>8){ alert( "ID不超过8个字符 "); i.fouse(); } else   if(PWlength>5) { alert( "密码不能超过5个字符 "); p.fouse(); } } </script></head><body><h1   align=center> Earnest   Bank </h1><table   align=center><caption>登录</caption><tr>  <td> ID </td>  <td><input   type="text"   name="i">  </td></tr><tr>  <td> password </td>  <td><input   type="password"   name="p">  </td></tr><tr   align=center>  <td   colspan=2><input   type="button" value= "确定" onClick="show()">  </td></tr>
[解决办法]
写错了把 正常没问题的
[解决办法]
JScript code<script   language= "JavaScript "> function   show() { var useID=document.getElementById("i"); var usep=document.getElementById("p"); if(useID.length>=8){ alert( "ID不超过8个字符 "); useID.focus(); } else  if(usep.length>=5) { alert( "密码不能超过5个字符 "); usep.focus();} } </script>

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