Question

var k=-1
var j=-1
var data={}
var data_h={}
var finish=false

chrome.webRequest.onBeforeSendHeaders.addListener(
    function(details) {
        j++;
        console.log('BeforeSendHeaders',j)
        console.log(finish)
        if(finish==false){
        //{ console.log('head')
        an=details.requestHeaders[1].value


        data_h[j]=an
        console.log(data_h)
        }   
    }
    , {
        urls: ["https://mms.pinduoduo.com/sydney/api/goodsDataShow/queryGoodsSpanDateList"]
    },
    ["blocking", "requestHeaders", "extraHeaders"]

)

 chrome.webRequest.onBeforeRequest.addListener(


    function(details)
    {
        k++;
        console.log('beforerequest',k)

        if(finish==false)
        {

        buffer=details.requestBody.raw[0].bytes     
        console.log(buffer)  
        var blob = new Blob([buffer]);
//将 Blob对象 读成字符串
        var reader = new FileReader();
        reader.onloadend = function (e) {
        setTimeout(function(){ var send=reader.result; //a Hello world!
                console.log(k,"次")

        data[k]=send}, 1);          
        }
        reader.readAsText(blob, 'utf-8');           
        }

        //} 
    },
    {urls: ["https://mms.pinduoduo.com/sydney/api/goodsDataShow/queryGoodsSpanDateList"]},
    ['requestBody']
); 

chrome.webRequest.onBeforeSendHeaders.addListener(
    function(details) {



        for (var j = 0; j < details.requestHeaders.length; ++j) {
            if (details.requestHeaders[j].name === 'Origin')
                details.requestHeaders[j].value = 'https://mms.pinduoduo.com';
        }



    }, {
        urls: ["https://mms.pinduoduo.com/sydney/api/goodsDataShow/queryGoodsSpanDateList"]
    },
    ["blocking", "requestHeaders", "extraHeaders"]

)

 chrome.runtime.onMessage.addListener(function(request, sender, sendResponse)
{
    finish=request

    sendResponse({head:data_h,body:data});
});

///////////////////////////////////////////////// ///////////////////////////////////////////////////// ///////////////////////////////////////////////////// //////// 此代码获取请求正文和请求标头，并将它们发送到content.js。控制台从1开始打印'k'，但不从0开始打印。我不知道为什么第一次filereader.onload不会第一次执行。我试过console.log（buffer）可以正确打印，但是console.log（k，“次”）不能。我想这仅仅是因为reader.onload

为什么filereader.onload第一次不执行？

0 个答案: