Proxy封装小程序的异步调用

function wxPromisify(fn) {
    return async function(args) {
        return new Promise((resolve, reject) => {
            fn({
                ...(args || {}),
                success: res => resolve(res),
                fail: err => reject(err)
            });
        });
    };
}

export function toAsync(names) {
    return (names || [])
        .map(name => (
            {
                name,
                member: wx[name]
            }
        ))
        .filter(t => typeof t.member === "function")
        .reduce((r, t) => {
            r[t.name] = wxPromisify(wx[t.name]);
            return r;
        }, {});
}

// pages/somepage/somepage.jsimport { toAsync } = require("../../utils/async");
// ...const awx = toAsync(["login", "request"]);await awx.login();await awx.request({...});

// utils/asyncjsfunction wxPromisify(fn) { ... }   
 // 前面已经定义过了export function asyncProxy(target) {    
 return new Proxy(target, {       
      cache: {},      
      get(it, prop) {       
          const aFn = this.cache[prop];   
          if (aFn) { return aFn; }  
          const v = it[prop];      
                if (typeof v !== "function") {          
                      return v;
            }            
            return this.cache[prop] = wxPromisify(v);
        }
    });
}

// app.jsimport { asyncProxy } from "./utils/async";

App({    onLaunch: function() {
        wx.awx = asyncProxy(wx);        // ....
    }
})

// pages/somepage/somepage// ...const { awx } = wx;await awx.login();await awx.request({...});

awx.login();
   ^^^^^^   get(wx, "login")