change index page when user logged in node code example

Example 1: how to set state for logged in users

var mongoose = require('mongoose'),
    Schema = mongoose.Schema,
    bcrypt = require('bcrypt'),
    SALT_WORK_FACTOR = 10;

var UserSchema = new Schema({
    username: { type: String, required: true, index: { unique: true } },
    password: { type: String, required: true }
});

module.exports = mongoose.model('User', UserSchema);

Example 2: how to redirect to another page in javascript on submit type

<script type="text/javascript" language="javascript">
function redirect()
{
    window.location.href="login.php";
}
</script>
<form  name="form1" id="form1" method="post">  
    <input type="submit" class="button4" name="order" 
        id="order" value="Place Order" onclick="redirect();" >
</form>