Safari扩展程序首次运行和更新 [英] Safari extension first run and updates

问题描述

在用户安装扩展程序后，如何知道我的Safari扩展程序代码是否第一次运行?

How can I know if my Safari extension code is running for the first time after the user has installed the extension?

我想区分扩展的新安装和扩展的更新.

I would like to differentiate between a new installation of the extension vs. an update of the extension.

我正在寻找与此答案非常相似的内容，但对于Safari，而不是适用于Chrome.在该链接中，我无法将答案中的代码翻译"到Safari.

I am looking for something very similar to this answer, but for Safari, instead of for Chrome. I haven't been able to "translate" the code from the answer in that link to Safari.

推荐答案

如果您可以不进行更新检查，则此脚本应该可以正常工作(与Chrome相关的答案比较):

If you can live without the update check, this script should work (compare with the Chrome related answer):

// In background page
function onInstall() {
  console.log('Extension installed');
}

var firstRun = typeof localStorage['extensionHasPreviouslyRun'] === 'undefined' ||
    !JSON.parse(localStorage['extensionHasPreviouslyRun']);

if (firstrun) {
  onInstall();
  localStorage['extensionHasPreviouslyRun'] = JSON.stringify(true);
}

如果还要检查更新，则需要从plist文件异步获取版本，如下所示:

If you want to check for updates also, you need to asynchronously get the version from the plist file, as so:

// In background page
function onInstall() {
  console.log('Extension installed');
}

function onUpdate() {
  console.log('Extension update');
}

function requestVersion(callback) {
  var xmlhttp = new XMLHttpRequest();
  xmlhttp.open('GET', 'info.plist');
  xmlhttp.onload = function () {
    var infoFile = xmlhttp.responseXML;
    var keys = infoFile.getElementsByTagName('key');
    for (var i = 0; i < keys.length; i++){
      if (keys[i].firstChild.data === 'CFBundleShortVersionString'){
        var version = keys[i].nextElementSibling.firstChild.data;
        callback(version);
        break;
      }
    }
  }
  xmlhttp.send();
}

requestVersion(function(version) {
  var storedVersion = localStorage['version'];
  if (storedVersion !== version) {
    // Check if we just installed this extension.
    if (typeof storedVersion === 'undefined') {
      onInstall();
    } else {
      onUpdate();
    }
    localStorage['version'] = version;
  }
});

这篇关于Safari扩展程序首次运行和更新的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！