ExtJS ComboBox加载远程数据的时候，怎么传递加号

[qwwwwwqqqq]

Ext.regModel("BookInfo", {
        fields: [{ name: "bookName" }]
    });
    var bookStore = Ext.create("Ext.data.Store", {
        model: "BookInfo",
        proxy: {
            type: "ajax",
            url: "bookSearchServer.ashx",
            reader: new Ext.data.ArrayReader({model:"BookInfo"})
        }
    });
    Ext.create("Ext.form.Panel", {
        title: "combobox远程数据源示例",
        frame: true,
        height: 100,
        width: 270,
        renderTo: Ext.getBody(),
        bodyPadding: 5,
        defaults: {
            labelSperator:":",
            labelWidth: 70,
            width: 200,
            labelAlign:"left"
        },
        items: [
            {
                xtype: "combo",
                fieldLabel: "书籍列表",
                listConfig: {
                    loadingText: "正在加载书籍信息",
                    empty: "未找到匹配值",
                    maxHegiht:60
                },
                allQuery: "allbook",
                minChars: 3,
                queryDelay: 300,
                queryParam: "searchbook",
                triggerAction: "all",
                store: bookStore,
                displayField: "bookName",
                valueField: "bookName",
                queryMode:"remote"
            }
        ]
    });

context.Response.ContentType = "text/plain";
        String bookName = context.Request.QueryString["searchbook"];
        //String bookName = context.Request.Form["searchbook"];
        String jav = "['java变成思想'],['java入门'],['javascriptr程序设计']";
        String cpp = "['c++编程思想'],['c++入门'],['c++程序设计']";
        String php = "['php程序设计'],['php入门'],['phph从入门到精通']";
        String books = "";
        if (bookName.Equals("allbook"))
        {
            books = "[" + jav + "," + cpp + "," + php + "]";
            context.Response.Write(books);
            return;
        }
        else
        {
            bookName = bookName.Substring(0, 3);
            if (bookName.Equals("jav"))
            {
                books = "[" + jav + "]";
            }
            else if (bookName.Equals("c++"))
            {
                context.Response.Write(bookName);
                books = "[" + cpp + "]";
            }
            else if (bookName.Equals("php"))
            {
                books = "[" + php + "]";
            }
            else 
            {
                context.Response.Write(bookName);
            }
        }
        context.Response.Write(books);

服务器使用的是ASP.NET的一般处理程序，
浏览器输入c++的时候。服务器没有反应，
str = str.replace(/\+/g,"%2B");
str = str.replace(/\&/g,"%26");
传递特殊字符之前要进行 编码，ComboBox在发起请求的时候怎么编码传递的参数

[qwwwwwqqqq]

没事自己顶一下。。

[清风_大侠]

在加号前面加个‘\’试试