How to access non static property from static func

问题:

I am mocking the User and need to implement static method findOne which is static so I do not need to extensiate User in my calling class:

export class User implements IUser {

    constructor(public name: string, public password: string) { 

        this.name = 'n';
        this.password = 'p';
    }

    static findOne(login: any, next:Function) {

        if(this.name === login.name) //this points to function not to user

        //code

        return this; //this points to function not to user
    }
}

But I can't access this from static function findOne is there a ways of doning it in typescript?

回答1:

It's not possible. You can't get an instance property from a static method because there is only one static object and an unknown number of instance objects.

You can, however, access static members from an instance. This will probably be useful for you:

export class User {
    // 1. create a static property to hold the instances
    private static users: User[] = [];

    constructor(public name: string, public password: string) { 
        // 2. store the instances on the static property
        User.users.push(this);
    }

    static findOne(name: string) {
        // 3. find the instance with the name you're searching for
        let users = this.users.filter(u => u.name === name);
        return users.length > 0 ? users[0] : null;
    }
}

回答2:

try this

export class test
{
 private static t:test;
 private name:string;
 constructor()
 {
   t=this;
 }

public static sample()
{
   return t.name;
}
}