javascript - Chrome.webNavigation.onBeforeNavigate 无法读取未定义的属性 'callback'

Question

我想使用chrome.webNavigation.onBeforeNavigate的回调来获取frameId和parentFrameId等框架信息。

后台页面代码:

chrome.webNavigation.onBeforeNavigate.addListener(onBeforeNaviCallback);

function onBeforeNaviCallback(detail){

    console.log("frameId" +detail.frameId); 

};//end of onBefore 

总是有错误:

 Error in event handler for 'webNavigation.onBeforeNavigate': Cannot read property 'callback' of undefined TypeError: Cannot read property 'callback' of undefined
        at Event.dispatch_ (event_bindings:342:58)
        at dispatchArgs (event_bindings:214:26)
        at Object.chromeHidden.Event.dispatchEvent (event_bindings:223:7)

Answer 1

切换顺序，在该行执行时它不知道你在说什么。

function onBeforeNaviCallback(detail){

    console.log("frameId" +detail.frameId); 

};//end of onBefore

chrome.webNavigation.onBeforeNavigate.addListener(onBeforeNaviCallback);