javascript - JS 提示Uncaught TypeError: undefined is not a function

Question

在使用百度clouda+的blendui开发，想实现一个页面跳转，点击按键事件有效果，但页面不跳转。
document.addEventListener("blendready", function ()
{
Blend.ui.layerInit("intro", function (dom)
{
$('#jump1', dom).click(function (e)
{

        Blend.ui.fire("createContentLayer", "intro");
         document.getElementById("intro").innerHTML=Date();          
    });

    var contentLayer;
    Blend.ui.on("createContentLayer", function (event)
     {
        if(Blend.ui.get("content"))
        {
            contentLayer.in();
            document.getElementById("intro").innerHTML="<b>shijian if</b>";
        }else{
            document.getElementById("intro").innerHTML="<b>shijian else</b>";
            contentLayer = new Blend.ui.Layer({
                "id": "content",
                "url": "content.html",
                "active": true
            });
        }
    });

    //回退事件处理
    Blend.ui.on("back", function (event) 
    {
       contentLayer.out();
    });
});

Blend.ui.layerInit("content", function (dom) {
    $('#nav-back', dom).click(function (e) {
        //触发回退操作
        Blend.ui.fire("back", "0");
    });
});

});