uni-app 将接口 promise 化

因为uni-app不彻底支持proxy，因此须要自行实现一个proxy类，代理uni的接口，将success和fail的回调转为resolve和reject.

promisfy.js

/*
 * @author: hruomei
 * @description: uni-app接口promise化
 * @create-time: 2020/05/19
 * @last-update-time: 2020//05/19
 * @version: V1.0
*/

let $uni;

// #ifdef MP
$uni = new Proxy(wx, {
	get: (target, key) => {
		return (options) => {
			return new Promise((resolve, reject) => {
				target[key]({
					...options,
					success: resolve,
					fail: reject
				});
			})
		}
	},
	set: (target, key, value) => {
		target[key] = value;
	}
})
// #endif

// #ifndef MP
$uni = new Proxy(uni, {
	get: (target, key) => {
		return (options) => {
			return new Promise((resolve, reject) => {
				target[key]({
					...options,
					success: resolve,
					fail: reject
				});
			})
		}
	},
	set: (target, key, value) => {
		target[key] = value;
	}
});
// #endif


export default $uni;

在main.js中 

import $uni from './commons/promisfy.js'

Vue.prototype.$uni = $uni

使用方式

this.$uni.getSystemInfo().then(res => {}).catch(e =>{})

以上方案若是测试有效，后面的内容就不须要看了（本人使用HbuilderX2.6.0以上版本测试H五、APP、小程序三端有效）

 

存在的隐患

uni-app官方文档中说明，IOS8/IOS9/Android设备不支持Proxy（可是我测了是能够用），因此咱们能够参考一下方案，模拟Proxy，实现代理

 

**这里只是一个小练习，H5端能够用，但在其余端uni对象被代理不能直接访问，因此在在H5端用着玩玩就好

promisfy.js

function isObject(target) {
	return typeof(target) === 'object' || target === null;
}

function clone(target) {
	if (!isObject(target)) return target;
	
	let newTarget = new Object();
	
	for (let i in target) {
		newTarget[i] = clone(target[i]);
	}
	
	return newTarget;
}

// 由于uni的API只有一个层级,因此这里只代理了1个层级的API,UniProxy只针对uni-app
function UniProxy(target, handle) {
	if (!isObject(target)) throw new Error('UniProxy(): variable "target" must be an object');
	
	let targetCopy = clone(target);
	
	Object.keys(targetCopy).forEach((key) => {
		Object.defineProperty(targetCopy, key, {
			get: () =>  {
				return handle.get && handle.get(target, key);
			},
			set: (newVal) => {
				handle.set && handle.set(target, key, newVal);
			}
		});
	});
	
	return targetCopy;
}


const $uni = new UniProxy(uni, {
	get: (target, key) => {
		return (options) => {
			return new Promise((resolve, reject) => {
				target[key]({
					...options,
					success: resolve,
					fail: reject
				});
			})
		}
	},
	set: (target, key, value) => {
		target[key] = value;
	}
});

export default $uni;

在main.js中 

import $uni from './commons/promisfy.js'

Vue.prototype.$uni = $uni

使用方式

this.$uni.getSystemInfo().then(res => {}).catch(e =>{})