《猛戳-查看个人博客地图-总有你意想不到的惊喜》本文内容：常见需求javascript
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <script src="http://cdn.static.runoob.com/libs/jquery/1.10.2/jquery.min.js"></script> <style> *{ margin: 0; padding: 0; } li{ list-style: none; } #scroll-item{ margin-top: 20px; } #scroll-item li{ width: 400px; height: 120px; margin-top: 300px; margin-left: 100px; background: aquamarine; font-size: 30px; } .item-border{ border: 10px solid #ff6700; } </style> </head> <body> <ul id="scroll-item"> <li>1</li> <li>2</li> <li>3</li> <li>4</li> <li>5</li> <li>6</li> <li>7</li> <li>8</li> </ul> </body> <script> $(document).ready(function(){ $(document).scroll(function() { let liArr = $('#scroll-item > li'); let scrollTop = $(document).scrollTop();//页面滚动的距离 for(let i=0,len=liArr.length;i<len;i++){ let top = liArr[i].offsetTop - scrollTop;//每一个元素距离页面顶部距离 if(top >= 300 && top <= 600){//元素距离浏览器窗口 顶部 的距离 if($(liArr).eq(i).prop("className") !== 'item-border'){ $(liArr).eq(i).addClass('item-border'); $(liArr).eq(i).siblings().removeClass('item-border'); } } } }); }); </script> </html>
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <script src="http://cdn.static.runoob.com/libs/jquery/1.10.2/jquery.min.js"></script> <style> *{ margin: 0; padding: 0; } li{ list-style: none; } .title{ width: 300px; height: 20px; background: aquamarine; } .title > span{ display: inline-block; width: 20px; height: 20px; border-radius: 10px; float: right; } .arrow-dis{ background: chartreuse; } .arrow-undis{ background: #ff6700; } .answer{ width: 300px; height: 50px; background: #ff6700; display: none; } </style> </head> <body> <div> <div class="title">问题一<span class="arrow-undis"></span></div> <div class="answer">这是问题一的答案</div> </div> <div> <div class="title">问题二<span class="arrow-undis"></span></div> <div class="answer">这是问题二的答案</div> </div> <div> <div class="title">问题三<span class="arrow-undis"></span></div> <div class="answer">这是问题三的答案</div> </div> </body> <script> $(document).ready(function(){ $('.title').on('click',function(){ let status = $(this).children('span').attr('class'); if(status === 'arrow-undis'){ $(this).siblings('.answer').css("display","block"); $(this).children('span').removeClass('arrow-undis').addClass('arrow-dis'); }else{ $(this).siblings('.answer').css("display","none"); $(this).children('span').removeClass('arrow-dis').addClass('arrow-undis'); } }); }); </script> </html>
window.addEventListener('scroll',this.scroll); window.removeEventListener('scroll',this.scroll); scroll(){ let screenH = window.screen.availHeight; let scrollTop = document.body.scrollTop; let documentH = document.body.scrollHeight; if(screenH + scrollTop >= documentH){ console.log('bottom'); } if(scrollTop <= 0{ console.log('top'); } }
var browser = { versions: function () { var u = navigator.userAgent, app = navigator.appVersion; return { //移动终端浏览器版本信息 trident: u.indexOf('Trident') > -1, //IE内核 presto: u.indexOf('Presto') > -1, //opera内核 webKit: u.indexOf('AppleWebKit') > -1, //苹果、谷歌内核 gecko: u.indexOf('Gecko') > -1 && u.indexOf('KHTML') == -1, //火狐内核 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('Linux') > -1, //android终端或uc浏览器 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 }; }(), language: (navigator.browserLanguage || navigator.language).toLowerCase() } if (browser.versions.mobile) {//判断是不是移动设备打开。browser代码在下面 var ua = navigator.userAgent.toLowerCase();//获取判断用的对象 if (ua.match(/MicroMessenger/i) == "micromessenger") { //在微信中打开 } if (ua.match(/WeiBo/i) == "weibo") { //在新浪微博客户端打开 } if (ua.match(/QQ/i) == "qq") { //在QQ空间打开 } if (browser.versions.ios) { //是否在IOS浏览器打开 } if(browser.versions.android){ //是否在安卓浏览器打开 } } else { //不然就是PC浏览器打开 }
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