阻止冒泡、默认行为、事件捕获

 /* 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;

 };

获取地址参数

 /* 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;

 };

判断微信环境

 /*

  *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;

     }

 };

获取环境参数

 /*

  *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

 // 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

 // 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;

 };

获取cookie

 /*

  *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 ""

 }

设置cookie

 /*

  *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())

 }

检测cookie

 /*

  *funname:checkCookie

  *des:检测cookie

  *params:

  *return:

  */

 function checkCookie() {

     username = getCookie('username')

     if (username != null && username != "") {

         return true;

     } else {

         return false;

     }

 }

获取localstorage

 /*

  *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 '';

 }

设置localstorage

 /*

  *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);

     }

 }

清空localstorage

/*

 *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)

  }

}

解决ios滚动问题的插件

 /**

  * 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);

 };

动态加载js

 /*

  *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);

}

克隆对象

/*

 *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。

移动端返回上一页

/*

 *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;

}

获取随机数

/*

 * 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));   

};

11位手机号码验证

function checkPhone(phone ){

    if(/^1(3|4|5|7|8)\d{9}$/.test(phone)){

        return true;

    }

    return false;

}

判断是否是汉字

function isChinese(str){

   var reg = /[\u4E00-\u9FA5\uF900-\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...