Question

我一直在努力解决谷歌扩展的问题，而你一直是我最后的希望！：））

好吧，我想点击Chrome扩展程序上的按钮，这会导致页面扩展程序上的keydown模拟正在运行。

我认为chrome在我的想法上有一些安全问题，它会阻止键盘模拟（使事件isTrusted：false）并删除哪个属性。

我写的函数在jsfiddle上运行正常，但看起来chrome扩展以不同的方式执行。

以下是内容脚本文件：

chrome.runtime.onMessage.addListener(function (request, sender, sendResponse) {
  if(request.action == "scrollToTop"){

  }
  else if(request.action == "scrollToBottom"){

  }
  else if(request.action == "enter"){
    triggerKeyboardEvent(document,13);
  }

  function triggerKeyboardEvent(el, keyCode){
    var event = new Event("keydown", {"bubbles":true, "cancelable":true});
    event.which = keyCode;
    el.dispatchEvent(event);
  }

});
chrome.runtime.sendMessage({action : "show"});

登录jsFiddle写道：

Event {isTrusted: false, which: 13}

登录网站：

document.addEventListener('keydown',function (e) {
      console.log(e)
}

写道：

Event {isTrusted: false}

Answer 1

感谢@ BG101和@Rob W我发现该解决方案是脚本注入！

唯一的事情就是根据MDN对KeyboardEvent.initKeyboardEvent（）进行了描述，所以我用以下代码替换了代码：

var event = new Event(event, {"bubbles":true, "cancelable":true});

另外，由于我希望触发器在文档上运行，我删除了元素选择器。这是我得到的：

chrome.runtime.onMessage.addListener(function (request, sender, sendResponse) {
  if(request.action == "scrollToTop"){
    triggerKeyboardEventOnDocument("keydown",38);

  }
  else if(request.action == "scrollToBottom"){
    triggerKeyboardEventOnDocument("keydown",40);

  }
  else if(request.action == "enter"){
    triggerKeyboardEventOnDocument("keydown",13);
  }

  function triggerKeyboardEventOnDocument(event, keyCode){
    var script = document.createElement('script');

    script.textContent = '(' + function(event, charCode) {

        //Create Event
        var event = new Event(event, {"bubbles":true, "cancelable":true});

        // Define custom values
        // This part requires the script to be run in the page's context
        var getterCode = {get: function() {return charCode}};
        var getterChar = {get: function() {return String.fromCharCode(charCode)}};
        Object.defineProperties(event, {
          charCode: getterCode,
          which: getterCode,
          keyCode: getterCode, // Not fully correct
          key: getterChar,     // Not fully correct
          char: getterChar
        });
        document.dispatchEvent(event);
      } + ')(' + '\"' + event + '\", '+ keyCode + ')';

    (document.head||document.documentElement).appendChild(script);
    script.parentNode.removeChild(script);
  }

});
chrome.runtime.sendMessage({action : "show"});

Keydown哪个无效Chrome扩展程序

1 个答案: