最近用了下localStorage,于是想记录加深下映象;
有关更详细的介绍,可以去看https://www.cnblogs.com/st-leslie/p/5617130.html;
我这引用了这个博客的优势介绍:大家可以了解下
一、什么是localStorage、sessionStorage
在HTML5中,新加入了一个localStorage特性,这个特性主要是用来作为本地存储来使用的,解决了cookie存储空间不足的问题(cookie中每条cookie的存储空间为4k),localStorage中一般浏览器支持的是5M大小,这个在不同的浏览器中localStorage会有所不同。
二、localStorage的优势与局限
localStorage的优势
1、localStorage拓展了cookie的4K限制
2、localStorage会可以将第一次请求的数据直接存储到本地,这个相当于一个5M大小的针对于前端页面的数据库,相比于cookie可以节约带宽,但是这个却是只有在高版本的浏览器中才支持的
localStorage的局限
1、浏览器的大小不统一,并且在IE8以上的IE版本才支持localStorage这个属性
2、目前所有的浏览器中都会把localStorage的值类型限定为string类型,这个在对我们日常比较常见的JSON对象类型需要一些转换
3、localStorage在浏览器的隐私模式下面是不可读取的
4、localStorage本质上是对字符串的读取,如果存储内容多的话会消耗内存空间,会导致页面变卡
5、localStorage不能被爬虫抓取到
localStorage与sessionStorage的唯一一点区别就是localStorage属于永久性存储,而sessionStorage属于当会话结束的时候,sessionStorage中的键值对会被清空
三:应用(自己项目的应用)
html
<!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width"> <meta http-equiv='x-ua-compatible' content='IE=Edge,chrome=1"' /> <meta http-equiv="Cache-Control" content="no-siteapp" /> <meta name="apple-mobile-web-app-capable" content="yes" /> <meta name="apple-touch-fullscreen" content="yes" /> <meta name="apple-mobile-web-app-status-bar-style" content="black" /> <script type="text/javascript" charset="utf-8" src="js/jquery/jquery-1.11.2.min.js"></script> <meta charset="utf-8" /> </head> <body> <div class="qiandao-right"> <div class="qiandao-top"> <div class="just-qiandao qiandao-sprits" id="js-just-qiandao"> </div> <p class="qiandao-notic" id="pHtml">今日未领短信,请立即签到!</p> </div> <div class="qiandao-bottom"> <div class="qiandao-rule-list"> <h4>签到规则</h4> <p>每签到获得10条短信的赠送。</p> <p>连续签到敬请期待。。。。</p> <p>连续签到16天及以上敬请期待。。。。</p> </div> <div class="qiandao-rule-list"> <h4>其他说明</h4> <p>每签到获得10条短信的赠送,一天只能领取一次</p> <p>其他活动敬请期待。。。。</p> </div> </div> </div> <div class="qiandao-layer qiandao-active" id="suQian"> <div class="qiandao-layer-con qiandao-radius"> <a href="javascript:;" class="close-qiandao-layer qiandao-sprits" id="close"></a> <div class="yiqiandao clear"> <div class="yiqiandao-icon qiandao-sprits"></div><br> </div> <div class="qiandao-jiangli qiandao-sprits"> <span class="qiandao-jiangli-num">10<em>条</em></span> </div> <p>您领取了10条短信<br>已经充入您的短信余额!</p> </div> <div class="qiandao-layer-bg"></div> </div> <script src="js/qianDao.js"></script> </body> </html>
css:
*{ margin:0; padding:0; } body,html{ background: #4d56a3; } .head { height: 56px; background-color: #4d56a3; line-height: 56px; font-size: 18px; color: #fff; } .qiandao-right{ width: 90%; margin: 0 auto; background: url(../img/qiandao_con.png) no-repeat; background-size: 100%; padding: 0 20px; box-sizing: border-box; } .qiandao-top { padding-top: 70px; height: 13pc; } .just-qiandao { margin: 0 auto 20px; width: 212px; height: 67px; cursor: pointer; } .qiandao-sprits { background-image: url(../images/qiandao_sprits.png); background-repeat: no-repeat; } .qiandao-notic { color: #b25d06; text-align: center; font-size: 18px; } .qiandao-rule-list { margin-bottom: 35px; color: #8d8ebb; font-size: 1pc; line-height: 26px; } .qiandao-rule-list h4 { font-weight: bolder; font-size: 1pc; } .qiandao-rule-list h4, .qiandao-rule-list p{ color: #8d8ebb; } .qiandao-notic { color: #b25d06; text-align: center; font-size: 18px; } .qiandao-sprits.active{ background-position: 0 -68px; pointer-events: none; } .qiandao-layer { position: fixed; top: 0; bottom: 0; left: 0; z-index: 888; display: none; width: 100%; } .qiandao-active .qiandao-layer-con { margin: -232px 0 0 -211px; width: 422px; height: 434px; } .close-qiandao-layer { position: absolute; top: 13px; right: 13px; width: 1pc; height: 1pc; background-position: -228px -51px; } .qiandao-sprits { background-image: url(../images/qiandao_sprits.png); background-repeat: no-repeat; } .yiqiandao { margin: 36px 0 0 40px; color: #666; font-size: 14px; line-height: 38px; } .clear { clear: both; } .yiqiandao .yiqiandao-icon { float: left; margin: 0 25px; width: 178px; height: 38px; background-position: -217px 0; } .qiandao-sprits { background-image: url(../images/qiandao_sprits.png); background-repeat: no-repeat; } .yiqiandao { margin: 36px 0 0 40px; color: #666; font-size: 14px; line-height: 38px; } .qiandao-jiangli { position: relative; margin: 45px auto; width: 335px; height: 170px; background-position: 0 -146px; } .qiandao-sprits { background-image: url(../images/qiandao_sprits.png); background-repeat: no-repeat; } .qiandao-jiangli span { position: absolute; top: 58px; left: 50px; display: block; width: 178px; height: 106px; color: #ff7300; text-align: center; font-weight: bolder; font-size: 30px; line-height: 106px; } .qiandao-jiangli span em { padding-left: 5px; font-style: normal; font-size: 1pc; } .qiandao-layer-bg { width: 100%; height: 100%; background-color: #000; opacity: .55; filter: alpha(opacity=55); } .qiandao-active .qiandao-layer-con { margin: 100px auto; width: 90%; margin-left: 5%; height: 440px; z-index: 100; position: absolute; box-sizing: border-box; } .qiandao-layer-con { z-index: 999; padding-top: 30px; border: 3px #33b23f solid; border-radius: 5px; background-color: #fff; } .qiandao-layer-con p{ text-align: center; color: #8c8c8c; } .headLeft:active { background-color: #363f8e; }
js
// 点击后效果 function dianJi(){ localStorage.dateMsg = dateMsg; qianDao.classList.add("active"); pHtml.innerHTML = "今日已领10条短信,请明日继续签到!"; suQian.style.display = "block"; } //关闭窗口 function closeCk() { suQian.style.display = "none"; } var qianDao = document.getElementById("js-just-qiandao"), pHtml = document.getElementById("pHtml"), close = document.getElementById("close"), suQian = document.getElementById("suQian"), dateMsg = new Array; date = new Date(), dateYear = date.getFullYear(), dateMonth = date.getMonth(), dateDate = date.getDate(); dateMsg = [dateYear, dateMonth, dateDate]; qianDao.addEventListener("click", dianJi); close.addEventListener("click", closeCk); (function() { var date = new Date(), old = new Array, dateY = date.getFullYear(), dateM = date.getMonth(), dateD = date.getDate(), newMsg = new Array, newMsg = [dateY, dateM, dateD]; old = localStorage.dateMsg.split(','); var oldY = old[0], oldM = old[1], oldD = old[2]; if(oldY == dateY && oldM == dateM && oldD == dateD){ qianDao.classList.add("active"); pHtml.innerHTML = "今日已领10条短信,请明日继续签到!"; } else { qianDao.classList.remove("active"); pHtml.innerHTML = "今日未领短信,请立即签到!"; localStorage.dateMsg = newMsg; } })(jQuery)
当然只是简单的应用,代码还没怎么整理,有不足之处,望指出。