加上这个函数：

<SCRIPT LANGUAGE="JavaScript">

function getCookiesPWD() {
    document.subform.pwd.style.color=‘#000‘
     var password = "";
         var cookies = document.cookie.split(";");
         //cookies=request.getCookies();
        
        if(cookies!=null){
            for(i=0;i<cookies.length;i++){
                var aCrumb = cookies[i].split("=");
                if ("cookie_tgt" == aCrumb[0])
                 password = unescape(aCrumb[1]);
                document.subform.pwd.value = http://www.mamicode.com/password;
            }
        }
 
}

</script>

表单调用：

<form name="subform" action="loginResult" method="post">
<br/>

<div align="center"><input type="text" name="pwd" value="http://www.mamicode.com/密码" onclick="getCookiesPWD()" onFocus="getCookiesPWD()" onBlur="if(!value){value=http://www.mamicode.com/defaultValue;this.style.color=‘#999‘}"    style="color:#999; width:200px; height:30px"/></div>
<br/><div align="center"><input type="submit" name="submit" id="btn" value="http://www.mamicode.com/登录"></div>
</form>

简单使用cookie记住密码