一般的な JS メソッドのカプセル化について説明する

function isWechat() { var ua = navigator.userAgent.toLowerCase(); if (ua.match(/MicroMessenger/i) == 'micromessenger') { return true; } else { return false; } }

function isPC() { var userAgentInfo = navigator.userAgent; var Agents = ['Android', 'iPhone', 'SymbianOS', 'Windows Phone', 'iPad', 'iPod']; var flag = true; for (var v = 0; v < Agents.length; v++) { if (userAgentInfo.indexOf(Agents[v]) > 0) { flag = false; break; } } return flag; }

function getUrlParam(name, url) { if (!url) url = location.href; if (url.indexOf('?') == -1) return ''; try { var re = new RegExp("" + name + "=([^&?]*)", "ig"); return ((url.match(re)) ? (decodeURIComponent(url.match(re)[0].substr(name.length + 1))) : ''); } catch (_e) { return ''; } }

function getCookie(name, defaultVal = null) { var arr, reg = new RegExp('(^| )' + name + '=([^;]*)(;|$)'); if (arr = document.cookie.match(reg)) { return unescape(arr[2]); } else { return defaultVal; } }

function setCookie(name, value, seconds) { var expires = new Date(); expires.setTime(expires.getTime() + parseInt(seconds) * 1000); var domain = document.domain; var domainArr = domain.split('.'); if (domainArr.length >= 3) { domainArr.shift(); domain = domainArr.join('.'); } document.cookie = escape(name) + '=' + escape(value) + (seconds ? ('; expires=' + expires.toGMTString()) : "") + '; path=/; domain=.' + domain + ';'; }

// this指上面的方法 function delCookie(name) { this.setCookie(name, '', -1); }

function toDesktop(sUrl,sName){ try { var WshShell = new ActiveXObject("WScript.Shell"); var oUrlLink = WshShell.CreateShortcut(WshShell.SpecialFolders("Desktop")+ "\\" + sName + ".url"); oUrlLink.TargetPath = sUrl; oUrlLink.Save(); }catch(e){ alert("当前IE安全级别不允许操作！"); } }

function AddFavorite(title, url){ try { window.external.addFavorite(url, title); }catch (e) { try { window.sidebar.addPanel(title, url, ""); }catch (e) { alert("抱歉，您所使用的浏览器无法完成此操作。\n\n加入收藏失败，请使用Ctrl+D进行添加"); } } }

function isEmpty(val){ if(typeof val == "undefined" || val == null || val == ""){ return true; } else { return false; } }

function inArray(search, array) { for (var i in array) { if (array[i] == search) { return true; } } return false; }

function arrayUnique(arr) { return [...new Set(arr)]; }

function setLocalstorage(key, value) { if(!window.Storage) { console.error("该浏览器不支持Localstorage属性!!"); return false; } else { localStorage.setItem(key, value); } }

function getLocalstorage(key) { var value = localStorage.getItem(key); if (value) { try { var value_json = JSON.parse(value); if (typeof value_json === 'object') { return value_json; } else if (typeof value_json === 'number') { return value_json; } } catch(e) { return value; } } else { return false; } }

function removeLocalstorage(key) { localStorage.removeItem(key); }

function clearLocalstorage() { localStorage.clear(); }