增加接口请求，review by 盖剑秋

@@ -3,11 +3,14 @@ module.exports = {
         // baseUrl: 'http://testapi.yoho.cn:28077',
         baseUrl: 'http://service.yoho.cn',
         privateKey: 'a85bb0674e08986c6b115d5e3a4884fa',
+        httpTimeout: 30000,	//毫秒
         
     },
     prd: {
     	baseUrl: 'http://service.yoho.cn',
         privateKey: 'a85bb0674e08986c6b115d5e3a4884fa',
+        httpTimeout: 30000,	//毫秒
+
     },
     storeKey: {
         SESSION_TOKEN_KEY: 'SESSION_TOKEN_KEY',

@@ -5,7 +5,7 @@ import CONFIG from '../constants/config';
 import DeviceInfo from 'react-native-device-info';
 import queryString from 'query-string';
 import md5 from 'md5';
-
+import timeoutPromise from '../utils/timeoutPromise';
 
 export default class Request {
 	
@@ -15,14 +15,29 @@ export default class Request {
 
 		this.baseUrl= this.config.baseUrl;
 		this.privateKey = this.config.privateKey;
+		this.timeout = this.config.httpTimeout;
 	}
 
 
+
+	/**
+	 * GET
+	 *
+	 * @param  {[object]} opts  
+	 *         		
+	 *   {
+	 *      url: '/operations/api/v6/category/getCategory', //接口地址
+	 *      timeout: 30,	//毫秒
+	 *   }
+	 *
+	 * @return {[promise]}    
+	 */
 	async get(opts) {
 		try {
 			let response = await this._fetch({
 				method: 'GET',
 				url: opts.url,
+				timeout: opts.timeout | 0,
 	    	});
 
 			let data = await this._parseResponse(response);
@@ -33,12 +48,29 @@ export default class Request {
 		}
 	}
 
+	/**
+	 * POST
+	 *
+	 * @param  {[object]} opts  
+	 *         		
+	 *   {
+	 *      url: '/operations/api/v6/category/getCategory', //接口地址
+	 *      body: {
+	 *      	user: 'Lily',
+	 *      	password: '111111',
+	 *      },
+	 *      timeout: 30,	//毫秒
+	 *   }
+	 *
+	 * @return {[promise]}    
+	 */
 	async post(opts) {
     	try {
 			let response = await this._fetch({
 				method: 'POST',
 				url: opts.url,
 				body: opts.body,
+				timeout: opts.timeout | 0,
 	    	});
 
 	    	let data = await this._parseResponse(response);
@@ -67,17 +99,16 @@ export default class Request {
 	* ### _fetch
 	*/  
 	async _fetch(opts) {
-		let defaultOpts = {
-			method: 'GET',
-			url: null,
-			body: null,
-			callback: null
-		};
+		let defaultOpts = this._defaultOpts();
 		opts = {
 			...defaultOpts,
 			...opts
 		};
-		opts.body = this._createBody();
+		opts.body = this._createBody(opts.body);
+
+		if (opts.timeout === 0) {
+			opts.timeout = this.timeout;
+		} 
 
 		let reqOpts = {
 			method: opts.method,
@@ -87,7 +118,8 @@ export default class Request {
 		};
 
 		if (opts.method === 'GET' || opts.method === 'POST') {
-			reqOpts.headers['Accept'] = 'application/json';
+			// reqOpts.headers['Accept'] = 'application/json';
+			reqOpts.headers['Content-Type'] = 'application/x-www-form-urlencoded';
 		}
 
 		let queryStrigPair = this._signParam(opts.body);
@@ -100,8 +132,20 @@ export default class Request {
 			reqOpts.body = queryStrigPair;
 		}
 
+		if (opts.timeout && opts.timeout > 0) {
+			return await timeoutPromise(opts.timeout, fetch(this.baseUrl + opts.url, reqOpts));
+		}
+
 		return await fetch(this.baseUrl + opts.url, reqOpts);
+	}
 
+	_defaultOpts() {
+		return {
+			method: 'GET',
+			url: null,
+			body: null,
+			callback: null,
+		};
 	}
 
 	_publicParams() {

+'use strict';
+
+export default function timeoutPromise(ms, promise) {
+	return new Promise((resolve, reject) => {
+		const timeoutId = setTimeout(() => {
+			reject(new Error("promise timeout"))
+		}, ms);
+		promise.then(
+			(res) => {
+				clearTimeout(timeoutId);
+				resolve(res);
+			},
+			(err) => {
+				clearTimeout(timeoutId);
+				reject(err);
+			}
+		);
+	});
+}
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