做项目是遇到一个封装的不错的Util类，写一下，长期备用：
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define(function(require, exports, module) { "use strict"; function Util() {} (function() { Util.isWindow = function(obj) { return obj !== null && obj === obj.window; }; Util.isFunction = function(obj) { return typeof obj === 'function'; }; Util.isObject = function(obj) { return typeof obj === 'object'; }; Util.isArray = function(obj) { return obj instanceof Array; }; Util.isPlainObject = function(obj) { return Util.isObject(obj) && !Util.isWindow(obj); }; Util.isString = function(obj) { return typeof obj === 'string'; }; // 将其他的object统统搞到一个object中去 // 这个函数不如直接写两个参数看着舒服 target objects，就不用各种slice shift了 Util.extend = function(target) { var deep; var args = [].slice.call(arguments, 1); if (typeof target === 'boolean') { deep = target; target = args.shift(); } args.forEach(function(arg) { extend(target, arg, deep); }); return target; // 这个函数就是把source里面的一层一层往下展开给target，object 和 array会一直展开 function extend(target, source, deep) { for (var key in source) { if (deep && (Util.isPlainObject(source[key]) || Array.isArray(source[key]))) { if (Util.isPlainObject(source[key]) && !Util.isPlainObject(source[key])) { target[key] = {}; } if (Array.isArray(source[key]) && !Array.isArray(target[key])) { target[key] = []; } extend(target[key], source[key], deep); } else { target[key] = source[key]; } } } }; Util.ajaxGet = function(url, data, callback) { // 简单学习一下XMLHttpRequest，一个JS对象，提供了封装的获得url上资源数据的方法，支持xml http ftp file // 步骤简单： open(method, url, sync), send(), 如果是异步的话 就调用onreadystatechange方法 var xhr = new XMLHttpRequest(); // 设置超时时间为30s xhr.timeout = 30000; xhr.onreadystatechange = function() { console.log("xhr.status is " + xhr.readyState); if (xhr.readyState === 4) { var status = 0; try { status = xhr.status; } catch(e) { // eat and ignore the exception, since access the status of XHR might cause a exception after timeout occurs; return; } if (status === 200) { var result = null; try { result = JSON.parse(xhr.responseText.replace(/\n|\r|\t|\b|\f/g, '')); } catch(e) { callback(null); return; } callback(result); } else { callback(null); } xhr.onreadystatechange = null; xhr = null; } }; xhr.withCredentials = true; xhr.open("GET", url + "?" + data, true); xhr.send(null); return xhr; }; Util.ajaxPost = function(url, data, callback) { var xhr = new XMLHttpRequest(); // 原来navigator除了online，还有个connection // 这个connection，而且这个connection很刁，何以拿到type，还有change事件 // 关键是一大堆浏览器都TM的不支持 var connection = navigator.connection; switch(connection.type) { case connection.WIFI : case connection.ETHERNET: xhr.timeout = 3000; break; case connection.CELL_3G: case connection.CELL_4G: xhr.timeout = 5000; break; case connection.CELL_2G: xhr.timeout = 30000; break; default : xhr.timeout = 30000; } // POST比GET复杂，首先不同网络timeout不一样，其次有很多事件需要监听 xhr.addEventListener("error", function(e) { if (e && e.loaded === 60) { // https error if (e.total === 9) { callback("CERTIFICATE TIME ERROR"); } else { callback("CERTIFICATE ERROR"); } } else { callback("NETWORK_ERROR"); } }); xhr.addEventListener("abort", function() { console.log("request abort!"); }); xhr.addEventListener("timeout", function() { callback("TIMEOUT"); }); xhr.addEventListener("readystatechange", function() { if (xhr.readyState === 4) { if (xhr.status === 200) { var result; try { result = JSON.parse(xhr.responseText.replace(/\n|\r|\t|\b|\f/g, '')); } catch(e) { callback("DATA_INVALID"); return; } callback(result); } else if (xhr.status !== 0) { callback("HTTP_ERROR"); } } }); // withCredentials = true 将使得请求会带上cookie xhr.withCredentials = true; xhr.open("POST", url, true); xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); xhr.send(data); return xhr; }; Util.abort = function(xhr) { xhr.abort; }; Util.getGeoLocation = function(callback) { var timeout = 30000; if (navigator.connection && navigator.connection.type) { switch (navigator.connection.type) { // wifi case 2: timeout = 8000; break; // 2G case 3: timeout = 30000; break; // 3g: case 4: timeout = 20000; break; default: timeout = 30000; break; } } // 这里就是浏览器获取地理位置的用法 navigator.geolocation.getCurrentPosition( function(position) { callback.call(this, position); }.bind(this), function(error) { callback.call(this, null); }.bind(this), { enableHighAccuracy: true, maximumAge: 180000, timeout: timeout }); }; // 实时定位, 返回一个ID，用来取消监听 Util.startWatchGeoLocation = function(callback) { return navigator.geolocation.watchPosition( function(position) { callback.call(this, position); }.bind(this), function() { callback.call(this, null); }.bind(this), { maximumAge: 600000, timeout: 20000 } ); }; Util.stopWatchGeoLocation = function(geoId) { navigator.geolocation.clearWatch(geoId); }; // 主要用来 ajax request中把object转为字符串 Util.paramToStr = function(params) { var data = ''; var isFirstChar = true; for (var key in params) { if (params.hasOwnProperty(key)) { if (isFirstChar === true) { isFirstChar = false; data += key + "=" + params[key]; } else { data += "&" + key + "=" + params[key]; } } } return data; }; // 预加载一个Image Util.preloadImage = function(images) { if (images && images.length) { for(var i = 0; i < images.length; i++) { var imgContainer = new Image(); imgContainer.src = images[i]; imgContainer = null; } } }; // 就是把 rgb(,,)换成了rgba(,,,) Util.addOpacity = function(color, opacity) { var newColor = color.replace(/rgb/g, "rgba").replace(/\)/g, "," + opacity + ")"); return newColor; }; Util.isOffline = function() { return !navigator.onLine; }; Util.getStorageValue = function(key) { var item = window.localStorage.getItem(key); if (!item) { return; } item = JSON.parse(item); var data = item.data; var type = item.type; var value = null; switch(type) { case "Boolean": value = Boolean(data); break; case "String": value = String(data); break; case "Number": value = Number(data); break; case "JSON": value = JSON.parse(data); break; } return value; }; Util.setStorageValue = function(key, value) { var type = null; var data = value; if (typeof value === "boolean") { type = "Boolean"; } else if (typeof value === "string") { type = "String"; } else if (typeof value === "number") { type = "Number"; } else if (typeof value === "object") { type = "JSON"; data = JSON.stringify(value); } window.localStorage.setItem(key, JSON.stringify({data: data, type: type})); } }).(); module.exports = Util; }); |