content

在使用 TypeScript 开发时，导入 Content 类很方便。但不要像这样一次导入一个内容元素：

import TextContent from "geoscene/popup/content/TextContent";
import MediaContent from "geoscene/popup/content/MediaContent";
import FieldsContent from "geoscene/popup/content/FieldsContent";
import AttachmentsContent from "geoscene/popup/content/AttachmentsContent";
import CustomContent from "geoscene/popup/content/CustomContent";
import ExpressionContent from "geoscene/popup/content/ExpressionContent";

您可以使用单行导入此模块的内容：

import { TextContent, MediaContent, FieldsContent, AttachmentsContent, CustomContent, ExpressionContent } from "geoscene/popup/content";

此模块还允许您在内容元素上实现 类型保护，使代码更智能。

import { Content } from "geoscene/popup/content";

function logContentElement(content: Content): void {
  if (content.type === "media") {
    console.log("内容是媒体");
  }
  else {
    // 编译器识别内容必须是 `text | fields | media | attachment | custom`
    console.log("弹出框内容无效！")
  }
}