app.json 下面导航栏入口，不好带参数

    "tabBar"  : {
        "color"             : "#000000",
        "backgroundColor"   : "#FFFFFF",
        "borderStyle"       : "#C3C3C3",
        "selectedColor"     : "#ff8161",
        "list"  :   [
            {
                "pagePath"          : "pages/index/index",
                "text"              : "首页",
                "iconPath"          : "images/common/index.png",
                "selectedIconPath"  : "images/common/index-s.png"
            },
            {
                "pagePath"  : "pages/product/product",//~~~这里不好带参数，即使其他页面由navigateTo进入，也不行，不带参数都不行，导航栏目只有从导航里面进去~~~
                "text"      : "产品",
                "iconPath"          : "images/common/p.png",
                "selectedIconPath"  : "images/common/p-s.png"
            },