我假装拦截来自 pouchDB 的函数并将其发送到日志 API。之后我会向任何需要使用的部分返回一个 promise 。
我创建了一个接受委托(delegate)和任何类型的参数的函数。但返回给我一条错误消息:
ERROR Error: Uncaught (in promise): TypeError: Cannot read property '_closed' of undefined
TypeError: Cannot read property '_closed' of undefined
at vendor.js:172457
at vendor.js:81588
at vendor.js:172415
at new t (polyfills.js:3)
at vendor.js:172402
at vendor.js:81588
at main.js:54
at new t (polyfills.js:3)
at LogSystemProvider.webpackJsonp.111.LogSystemProvider.interceptAndDebug (main.js:52)
at DbService.webpackJsonp.43.DbService.bulkDocs (main.js:6141)
功能:
public interceptAndDebug(func: DelegateDTO): Promise<any>;
public interceptAndDebug(func: DelegateDTO, param: any): Promise<any>;
public interceptAndDebug(func: DelegateDTO, param?: any): Promise<any> {
return new Promise((resolve, reject) => {
if(param){
func( param )
.then((res)=>{
let msg: ValueDebug = {
nameFunc: func.name,
param: param,
sucess: res
}
this.CreateLog({
msg: JSON.stringify(msg),
isDebugger: true
});
resolve(res);
})
.catch((err)=>{
let msg: ValueDebug = {
nameFunc: func.name,
param: param,
error: err
}
this.CreateLog({
msg: JSON.stringify(msg),
isDebugger: true
});
reject(err)
});
}else{
func()
.then((res)=>{
let msg: ValueDebug = {
nameFunc: func.name,
param: param,
sucess: res
}
this.CreateLog({
msg: JSON.stringify(msg),
isDebugger: true
});
resolve(res);
})
.catch((err)=>{
let msg: ValueDebug = {
nameFunc: func.name,
param: param,
error: err
}
this.CreateLog({
msg: JSON.stringify(msg),
isDebugger: true
});
reject(err)
});
}
});
}
委托(delegate)DTO:
export interface DelegateDTO {
(any?): Promise<any>;
}
函数的使用:
bulkDocs( list: Array<any> ){
return this._logSystem.interceptAndDebug(this._db.bulkDocs, list);
}
有人可以帮助我吗?
最佳答案
如果 bulkDocs
是 this._db
的方法,您可能需要绑定(bind)它,这样它就不会丢失 this._db
的上下文>:
return this._logSystem.interceptAndDebug(this._db.bulkDocs.bind(this._db), list);
关于angular - 函数从 pouchDB 获取委托(delegate),插入一些调试数据并返回一个 promise ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/52101073/