TiddlyWiki JSON Tiddler 类：将 Tiddler 转换为 JSON 格式

class JsonTiddler {\n constructor(title) {\n this.title = title;\n }\n\n run() {\n const title = this.title || this.getVariable("currentTiddler");\n const tiddler = !!title && this.wiki.getTiddler(title);\n const fields = {};\n\n if (tiddler) {\n for (const field in tiddler.fields) {\n fields[field] = tiddler.getFieldString(field);\n }\n }\n\n return JSON.stringify(fields, null, $tw.config.preferences.jsonSpaces);\n }\n}\n\nmodule.exports = JsonTiddler;