HTML中javascript实现 简单登录功能（源码）
<html><body>
<form name="login" onsubmit="javascript:return chkfrm(this);">
用户名:<input type="text" name="username" onpropertychange="if(this.value.length>=8)this.form.userpwd.focus();"><br>
密码:<input type="password" name="userpwd"><br>
<input type="submit" value="登录"> <input type="reset" value="重置">
</form>
<script language="javascript">
function chkfrm(o){
if(o.username.value==''){
alert('请输入用户名！');
return false;
}
if(o.userpwd.value==''){
alert('请输入密码！');
return false;
}
alert('登陆成功');
return false;
}
</script>
</body>
</html>
<form name="login" onsubmit="javascript:return chkfrm(this);">
用户名:<input type="text" name="username" onpropertychange="if(this.value.length>=8)this.form.userpwd.focus();"><br>
密码:<input type="password" name="userpwd"><br>
<input type="submit" value="登录"> <input type="reset" value="重置">
</form>
<script language="javascript">
function chkfrm(o){
if(o.username.value==''){
alert('请输入用户名！');
return false;
}
if(o.userpwd.value==''){
alert('请输入密码！');
return false;
}
alert('登陆成功');
return false;
}
</script>
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