js保存用户名

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javascript

<head> 
<title>js COOKIE 记住帐号或密码</title> 
<script language="javascript" type="text/javascript"> 
function checkInCorrect()      //判断用户名和密码是否为空
{
     if (document.getElementById('txtUserName').value=="")
   {
    alert('请输入用户名！')
    document.getElementById('txtUserName').focus();
    return false
   }
   if (document.getElementById('txtPassword').value=="")
   {
    alert('请输入密码！')
    document.getElementById('txtPassword').focus();
    return false
   }
   else
   {
    saveInfo();
    return true;
   }
}


saveInfo = function(){
try{
   var isSave = document.getElementById('chkRememberPwd').checked;   //保存按键是否选中
   if (isSave) {
    var usernm = document.getElementById('txtUserName').value;
    var userpsw = document.getElementById('txtPassword').value;
    if(usernm!="" && userpsw!=""){
     SetCookie(usernm,userpsw);
    }
   }else {  
    SetCookie("","");
   }
}catch(e){

}
}

function SetCookie(usern,psw){
var Then = new Date() 
Then.setTime(Then.getTime() + 1866240000000) 
document.cookie ="username=" + usern + "%%"+psw+";expires="+ Then.toGMTString() ;
}


function GetCookie(){ 
var nmpsd;
var nm;
var psd;
var cookieString = new String(document.cookie)
var cookieHeader = "username="
var beginPosition = cookieString.indexOf(cookieHeader)
cookieString = cookieString.substring(beginPosition);
var ends=cookieString.indexOf(";");
if (ends!=-1){
   cookieString = cookieString.substring(0,ends);
}
if (beginPosition>-1){
   nmpsd = cookieString.substring(cookieHeader.length);
   if (nmpsd!=""){
    beginPosition = nmpsd.indexOf("%%");
    nm=nmpsd.substring(0,beginPosition);
    psd=nmpsd.substring(beginPosition+2);
    document.getElementById('txtUserName').value=nm;
    document.getElementById('txtPassword').value=psd;
    if(nm!="" && psd!=""){
     document.forms[0].checkbox.checked = true
    }
   } 
}
}
</script> 
</head> 
<body onLoad="document.getElementById('txtUserName').focus();GetCookie();">
<form>
	用户名:<input type="text" ID="txtUserName" onblur="GetPwdAndChk()"> <br>
	密  码:<input type="password" ID="txtPassword"> <br>
	<input type="checkbox" ID="chkRememberPwd" />记住密码 <br>
	<input type="button" OnClick="checkInCorrect()" value="进入"/> 
</form>	
</body>

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