dispatchMessage 和关联数组

发布于 2024-10-06 10:36:32 字数 904 浏览 10 评论 0原文

我在将关联数组传递给注入脚本时遇到问题。

Global.html

  var settings = new Array();

  settings["accountID"] = safari.extension.settings.getItem("accountID");
  settings["accountName"] = safari.extension.settings.getItem("accountName");
  settings["accountEmail"] = safari.extension.settings.getItem("accountEmail");

            safari.application.activeBrowserWindow.activeTab.page.dispatchMessage("settingsArray", settings);

script.js

 switch (msgEvent.name) {
      case "settingsArray":
           var settings = new Array();
           settings = msgEvent.message;
           console.log("accountID: " + settings["accountID"]);

           break;

当我使用“普通”数组时，它工作得很好！

但是当提供关联数组时，我总是得到调用时显示“未定义”，例如。 settings["accountID"]

有人知道出了什么问题吗？

原文

I have a problem delivering assiciative arrays to an injected script.

Global.html

  var settings = new Array();

  settings["accountID"] = safari.extension.settings.getItem("accountID");
  settings["accountName"] = safari.extension.settings.getItem("accountName");
  settings["accountEmail"] = safari.extension.settings.getItem("accountEmail");

            safari.application.activeBrowserWindow.activeTab.page.dispatchMessage("settingsArray", settings);

script.js

 switch (msgEvent.name) {
      case "settingsArray":
           var settings = new Array();
           settings = msgEvent.message;
           console.log("accountID: " + settings["accountID"]);

           break;

When I do it with "normal" arrays, it works fine!

But when delivering associative arrays, I always get "undefined" when calling eg. settings["accountID"]

Does anyone have an idea what's wrong?

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白日梦 2024-10-13 10:36:32

当你应该使用对象时，你却使用了数组。

var settings = new Array(); // 错误的
变量设置 = {}; // 正确（比“new Object()”更好）

您没有必要使用字符串形式的属性访问。
```
设置["accountID"] = …; // 可以，但是输入太多
设置.accountID = ...; // 完全相同的功能
```
如果属性名称不是有效的 JavaScript 标识符，则在获取/设置属性值时只需使用方括号表示法（例如 foo["holy!*#$! it Works"] = true）或者如果您需要从变量构造属性名称（例如foo["account"+n] = "active";）。

您正在创建新对象然后把它们扔掉。

 var settings = new Array(); // 创建一个由变量引用的新数组
 设置= msgEvent.message; // 丢弃数组并更改变量
                              // 引用一个新对象

You're using arrays when you should be using objects.

var settings = new Array();  // Wrong
var settings = {};           // Right (and better than "new Object()")

You are unnecessarily using the string form of property access.
```
settings["accountID"] = …;   // Works, but too much typing
settings.accountID = …;      // Exact same functionality
```
You only need to use the bracket notation when getting/setting property values if the property name is not a valid JavaScript identifier (e.g. foo["holy!*#$! it works"] = true) or if you need to construct the property name from a variable (e.g. foo["account"+n] = "active";).

You are creating new objects and then throwing them away.

 var settings = new Array();  // Makes a new array referenced by a variable
 settings = msgEvent.message; // Discards the array and changes the variable
                              // to reference a new object

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