正确声明本地函数 angular2 + 打字稿

Question

我

正在将角度 1 转换为角度 2(离子 2(，我创建了这个提供程序来替换服务，但我的本地函数出错。

如何使用 angular2 和 Typescript 声明本地函数？

import { Injectable } from '@angular/core';

@Injectable()
export class PouchSeed {
    constructor() { }
    function normalizeDoc(doc, id) {
        function normalize(doc) {
            doc = angular.copy(doc);
            Object.keys(doc).forEach(function (prop) {
                var type = typeof doc[prop];
                if (type === 'object') {
                    doc[prop] = normalize(doc[prop]);
                } else if (type === 'function') {
                    doc[prop] = doc[prop].toString();
                }
            });
            return doc;
        }
        var output = normalize(doc);
        output._id = id || doc._id;
        output._rev = doc._rev;
        return output;
    }
    ....
    seed(db, designDocs, callback) {
        if (!db || !designDocs) {
            throw new TypeError('`db` and `design` are required');
        }
        var local = objMapValues(objMapKeys(designDocs, addDesign), normalizeDoc);
        var seedPromise = db.allDocs({include_docs: true, keys: Object.keys(local)})
                .then(function (docs) {
                    var remote = {};
                    docs.rows.forEach(function (doc) {
                        if (doc.doc) {
                            remote[doc.key] = doc.doc;
                        }
                    });
                    var update = Object.keys(local).filter(function (key) {
                        if (!remote[key])
                            return true;
                        local[key]._rev = remote[key]._rev;
                        return !docEqual(local[key], remote[key]);
                    }).map(function (key) {
                        return local[key];
                    });
                    if (update.length > 0) {
                        return db.bulkDocs({docs: update});
                    } else {
                        return Promise.resolve(false);
                    }
                })
                .then(function (result) {
                    if (typeof callback === 'function') {
                        callback(null, result);
                    }
                    return Promise.resolve(result);
                })
                .catch(function (err) {
                    if (typeof callback === 'function') {
                        callback(err, null);
                    }
                    console.log(err);
                    return Promise.reject(err);
                });
        return seedPromise;
    };

}

错误：

Typescript Error
Unexpected token. A constructor, method, accessor, or property was expected.
src/providers/pouch-seed.ts
    function normalizeDoc(doc, id) {
        function normalize(doc) {

Answer 1

从您使用该normalizeDoc方法的方式来看，它不需要是嵌套函数。因此，您可以将课程更改为：

@Injectable()
export class PouchSeed {
    constructor() { }
    normalizeDoc(doc, id) {
        var output = this.normalize(doc);   // <-- note how you call your normalize method
        output._id = id || doc._id;
        output._rev = doc._rev;
        return output;
    }
    normalize(doc) {
      doc = angular.copy(doc);
      Object.keys(doc).forEach(function (prop) {
        var type = typeof doc[prop];
        if (type === 'object') {
          doc[prop] = normalize(doc[prop]);
        } else if (type === 'function') {
          doc[prop] = doc[prop].toString();
        }
      });
      return doc;
    }
    ....
}