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chrome_extensions_and_apps_programming's Issues

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vrdj03213213213 fdsafdsafdsa

一个同步/异步问题讨论

一个同步/异步问题讨论

这个问题本质上是js同步异步的问题,和这个仓库教程没有太大关系,但是问题困扰我很久了,所以斗胆发个issue,大家讨论下。

问题还原:我这里想做的事情是
1,拦截http请求,然后对请求头进行修改一些修改,也就是用 :chrome.webRequest.onBeforeSendHeaders.addListener这个函数。

2,这函数里面接受一个参数,对传入的请求对象某些操作,大概也就是这样:

chrome.webRequest.onBeforeSendHeaders.addListener(
    function(details){
       //do something 
       return {requestHeaders: details.requestHeaders};
    },
    {
        urls: [
            "<all_urls>"
        ]
    },
    [
        "blocking",
        "requestHeaders"
    ]
);

3,这里,具体怎么修改details对象,我需要根据用户的设置进行操作;而且这里,我想将用户的设置存在chrome.storage.sync 方便设置能进行同步。但是 chrome.storage.sync.get是个异步函数,通过get拿到存储信息之后,并不能返回出来,而要传入一个回调函数。

这时候就成了这样:

function(details){
    chrome.storage.sync.get('user_settings',function (result) {
        //根据拿到的用户设置,来操作details
    })
    return {requestHeaders: details.requestHeaders}
}

但是我们知道,这样由于异步的关系,这样details并没有被修改,就直接返回了,所以说从sync中读取数据并进行相关操作,并没有生效

这里,我尝试了Promise、async/await等各种办法,都没能解决这里异步函数拿到返回值再进行相关操作的问题。

不知道这里有什么解决办法,还是说由于js本身的异步机制没办法解决?

关于http_server应用代码中background.js代码的一个疑问

您好!我在浏览器运行了一下http_server这个应用,其中background.js中有一段代码(52-54行):

var body = "<h1>It Works!</h1>"+
"<hr />"+
"Request Header:<br />"+header;


在浏览器显示是:

It Works!

当我想把"It Works"变为中文字符的时候会出现乱码,请问是什么原因呢?
另外您在书中提到"http协议中,一个字符占8位,故仅需1个字节就可完成存储",那么我想问下如果遇到中文字符,一个汉字占2个字节,http协议1个字节如何完成存储呢?

此扩展程序可能已损坏

我下载下来代码,给 my_clock 那个扩展打包,能成功加载到浏览器,但是点击图标的时候一闪而过,提示 此扩展程序可能已损坏 这个是咋回事呢?

image

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