// fs.readFile('a.txt', (d) => {console.log('d')})
// =>
// promisify(fs.readFile)('a.txt').then((d) => console.log(d))

function promisify(method) {
    const ctx = this
    return function() {
        let args = Array.prototype.slice.call(arguments)

        return new Promise((resolve, reject) => {
            args.push((() => {
                return function (err, result) {
                    if (err) {
                        return reject(err)
                    }
                    return resolve(result)
                }
            })())
            method.apply(ctx, args)
        })
    }
}

const fs = require('fs')

const fp = promisify(fs.readFile)
fp('./test.html', 'utf-8').then((d) => {
    console.log(d, 'dd')
}).catch(err => console.log(err))


// promise for miniprogame
function promisify(callback) {
    return (params = {}) => {
        return new Pormise((reslove, reject) => {
            params = Object.assign(params, {
                success: function(result) {
                    reslove(result)
                },
                fail: function(err) {
                    reject(err)
                }
            })
        })
    }
}
const pwx = new Proxy({}, {
    get(target, name) {
        if (name in wx) {
            return promisify(wx[name])
        }
    }
})
pwx.login().then()