谷歌浏览器插件的跨域问题

Question

我碰到的问题如下：

我的manifest.json文件代码如下：

{
  "manifest_version": 2,
  "name": "test",
  "description": "测试",
  "version": "0.1",
  "browser_action": {
    "default_popup": "hello.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://pan.baidu.com/share/init*",
        "http://pan.baidu.com/share/init*",
        "https://pan.baidu.com/s/*",
        "http://pan.baidu.com/s/*"
      ],
      "js": [
        "jquery-3.2.1.min.js",
        "yp.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "https://www.baidu.com/"
  ]
}

我的yp.js文件代码如下：

var xhr = new XMLHttpRequest();
xhr.open("GET", "https://www.baidu.com/", true);
xhr.onreadystateChange = function () {
  if (xhr.readyState == 4) {
    console.log(xhr.responseText);
  }
}
xhr.send()

请各位大哥帮帮忙！