Html 5 + webview cannot listen for loaded events

var wv = plus.webview.create (

)

    config.url,
    config.id,
    {
        top: 0, // 
        bottom: 0, // 
        render: "always",
        popGesture: "close",
        bounce: "vertical",
        bounceBackground: "-sharpefeff4",
        ...style
    },
    extras
)
var w = plus.nativeUI.showWaiting()
// 
wv.addEventListener(
    "loaded",
    function() {
        console.log("New Window loaded!") 
        wv.show() //  "pop-in"
        w.close()
        w = null
    },
    false
)

the log in the callback did not go, and the page could not be opened. Android 4.4.4 is sometimes easy to use or not. no, no, no.
the question found on http://ask.dcloud.net.cn/ques.
does not mention the solution