使用S+H框架进行数据的UPDATE操作，发现字段中的“+”无法更新

    function save(x) {
        var c = confirm("确认保存吗");
        if(c==true){
            var bookcode = x.substring(1);
            //alert(id);
        //    var alrights = document.getElementById(id).value;
            var bookname=document.getElementById("N"+bookcode).value;
            var salemoney=document.getElementById("M"+bookcode).value;
            var discount=document.getElementById("D"+bookcode).value;
        //    var provideprice=document.getElementById("P"+bookcode).value;
        //    alert(bookcode+bookname+salemoney+discount);
            window.location.href="anhuiyonger/Anhuiyonger_savechange.action?bookcode="+bookcode+"&bookname="+bookname+"&salemoney="+salemoney+"&discount="+discount+"";
        
    }