js常用的函数库

摘要：移动端返回上一页移动端返回上一页如果不支持，返回首页的和有获取随机数获取随机数位手机号码验证判断是否是汉字中日韩统一表意字符。后至为空兼容象形文字。后至为空不定期更新，看心情更新参考链接

 /* funname preventEventPropagation
  * desc 阻止冒泡事件&阻止默认行为&阻止事件捕获
  * params {name: string}参数名称
  * return {string or null}
  */
 var preventEventPropagation = function(evt) {
     var e = evt || window.event;
     if (e) {
         e.preventDefault();
         e.stopPropagation();
     }
     return false;
 };

 /* funname getQueryString
  * desc 获取地址参数
  * params {name: string}参数名称
  * return {string or null}
  */
 var getQueryString = function(name) {
     var r, reg;
     reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
     r = window.location.search.substr(1).match(reg);
     if (r !== null) {
         return r[2]; //不解码
     }
     return null;
 };

 /*
  *desc:判断微信环境
  *params：null
  */
 var isInWechat = function() {
     var ua = navigator.userAgent.toLowerCase();
     if (ua.match(/MicroMessenger/i) == "micromessenger") {
         return true;
     } else {
         return false;
     }
 };

 /*
  *funname:platformFn
  *des:获取环境参数
  *params: 
  *return: [object]
  */
 var platformFn = function() {
     var u = navigator.userAgent,
         app = navigator.appVersion;
     return {
         webKit: u.indexOf("AppleWebKit") > -1, //苹果、谷歌内核
         mobile: !!u.match(/AppleWebKit.*Mobile.*/), //是否为移动终端
         ios: !!u.match(/(i[^;]+;( U;)? CPU.+Mac OS X/), //ios终端
         android: u.indexOf("Android") > -1 || u.indexOf("Adr") > -1, //android终端
         iPhone: u.indexOf("iPhone") > -1, //是否为iPhone或者QQHD浏览器
         iPad: u.indexOf("iPad") > -1, //是否iPad
         webApp: u.indexOf("Safari") == -1, //是否web应该程序，没有头部与底部
         weixin: u.indexOf("MicroMessenger") > -1, //是否微信 （2015-01-22新增）
     };
 };

 // 判断是否为数组
 /*
  *funname:isArray
  *des:判断是否为数组
  *params: [array] arr
  *return: [bolean]
  */
function isArray(arr) {
    if (arr typeof arr === "object" && arr.constructor == Array) {
        return true;
    }
    return false;
}

 // 数组除重
 /*
  *funname:arrayUnique
  *des:数组去重
  *params: [array] arr
  *return: [array]
  */
 var arrayUnique = function(arr) {
     var newArr = [];
     var temp = {};
     var len = arr.length;
     for (var index = 0; index < len; index++) {
         var key = typeof(arr[index]) + arr[index];
         if (temp[key] !== 1) {
             newArr.push(arr[index]);
             temp[key] = 1;
         }
     }
     return newArr;
 };

 /*
  *funname:getCookie
  *des:获取cookie
  *params: [array] arr
  *return: [array]
  */
 function getCookie(c_name) {
     if (document.cookie.length > 0) {
         c_start = document.cookie.indexOf(c_name + "=")
         if (c_start != -1) {
             c_start = c_start + c_name.length + 1
             c_end = document.cookie.indexOf(";", c_start)
             if (c_end == -1) c_end = document.cookie.length
             return unescape(document.cookie.substring(c_start, c_end))
         }
     }
     return ""
 }

 /*
  *funname:setCookie
  *des:设置cookie
  *params: [string] c_name,[string] value,expiredays
  *return: [array]
  */
 function setCookie(c_name, value, expiredays) {
     var exdate = new Date()
     exdate.setDate(exdate.getDate() + expiredays)
     document.cookie = c_name + "=" + escape(value) +
         ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString())
 }

 /*
  *funname:checkCookie
  *des:检测cookie
  *params: 
  *return: 
  */
 function checkCookie() {
     username = getCookie("username")
     if (username != null && username != "") {
         return true;
     } else {
         return false;
     }
 }

 /*
  *funname:getLocalStorage
  *des:获取localstorage
  *params: [string] key
  *return: [string]
  */
 function getLocalStorage(key) {
     if (localStorage) {
         return localStorage.getItem(key);
     } else {
         // 使用cookie获取
         return getCookie(key);
     }
     return "";
 }

 /*
  *funname:setLocalStorage
  *des:设置localstorage
  *params: 
  *return: null
  */
 function setLocalStorage(key, value, expiredays) {
     if (localStorage) {
         console.log(setLocalStorage);
         localStorage.setItem(key, value);
     } else {
         // 使用cookie保存
         setCookie(key, value, expiredays);
     }
 }

/*
 *funname:clearLocalStorage
 *des:清空localstorage
 *params: [string] key
 *return: [string]
 */
function clearLocalStorage(key) {
  if (localStorage) {
    localStorage.removeItem(key);
  } else {
    // 使用cookie获取
    clearCookie(key)
  }
}

 /**
  * ScrollFix v0.1
  * http://www.joelambert.co.uk
  *
  * Copyright 2011, Joe Lambert.
  * Free to use under the MIT license.
  * http://www.opensource.org/licenses/mit-license.php
  * des: 解决ios滚动问题的插件
  */

 var ScrollFix = function(elem) {
     // Variables to track inputs
     var startY, startTopScroll;

     elem = elem || document.querySelector(elem);

     // If there is no element, then do nothing  
     if (!elem)
         return;

     // Handle the start of interactions
     elem.addEventListener("touchstart", function(event) {
         startY = event.touches[0].pageY;
         startTopScroll = elem.scrollTop;

         if (startTopScroll <= 0)
             elem.scrollTop = 1;

         if (startTopScroll + elem.offsetHeight >= elem.scrollHeight)
             elem.scrollTop = elem.scrollHeight - elem.offsetHeight - 1;
     }, false);
 };

 /*
  *funname:loadScript
  *des:动态加载js
  *params: [string] filepath,[function] onloadCallback
  *return: null
  */
function loadScript(filepath, onloadCallback) {
    var scriptDom = document.createElement("script");
    scriptDom.onload = scriptDom.onreadystatechange = onloadCallback;
    scriptDom.type = "text/javascript";
    scriptDom.src = filepath;
    document.body.appendChild(scriptDom);
}

/*
 *desc:针对纯 JSON 数据对象的深拷贝
 *params：[object] obj
 */
var cloneObj = function(obj) {
  if (obj) {
    var newObj = JSON.stringify(obj)
    newObj = JSON.parse(newObj)
    return newObj
  }
  return null
};

局限性：

 - 无法复制函数 
 - 原型链没了，对象就是object，所属的类没了。

/*
 *desc:移动端返回上一页
 *params：
 */
var appGoBack = function() {
  if (!url || url == "") {
    window.history.go(-1);
    setTimeout(function() {
      // 如果不支持history.go，返回首页
      location.replace("/");
    }, 300);
  } else {
    // ios的.history.go和history.back有bug
    location.replace(url);
  }
  return false;
}

/*
 * funname:GetRandomNum
 *params:[number]
 * des:获取随机数
 *return:
 */
var getRandom = function(Min, Max) {   
  var Range = Max - Min;   
  var Rand = Math.random();   
  return (Min + Math.round(Rand * Range));   
};

function checkPhone(phone ){ 
    if(/^1(3|4|5|7|8)d{9}$/.test(phone)){ 
        return true; 
    }
    return false; 
}

function isChinese(str){   
   var reg = /[u4E00-u9FA5uF900-uFA2D]/;
   return reg.test(str);
}

//u4e00-u9fbf:  unicode CJK(中日韩)统一表意字符。u9fa5后至u9fbf为空
//uF900-uFAFF:  unicode CJK 兼容象形文字  。uFA2D后至uFAFF为空

不定期更新，看心情更新~

参考链接：http://www.cnblogs.com/baiyyg...