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jQuery

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1、jQuery 简介 1.1 jQuery --->jQuery是一个优秀的JavaScript框架，其宗旨是 ――WRITE LESS,DO MORE, 写更少的代　码 , 做更多的事情。 --->jQuery是一个快速的，简洁的JavaScript库使用户能更方便地处理 HTML documents 、 events 、实现动画效果，并且方便地为网站提供 AJAX 交互。 ---> jQuery 还有一个比较大的优势是，它的文档说明很全，而且各种应用也说得很详细，同时还有许多成熟的插件可供选择。 ---> jQuery 能够使用户的 html 页保持代码和 html 内容分离，也就是说，不用再在 html 里面插入一堆 js 来调用命令了，只需定义 id 即可。 1.2 jQuery 对象 jQuery 对象就是通过 jQuery 包装 DOM 对象后产生的对象。 jQuery 对象是 jQuery 独有的 . 如果一个对象是 jQuery 对象 , 那么它就可以使用 jQuery 里的方法 : $(“#test”).html(); 比如： $("#test").html() 意思是指：获取 ID Ϊ test 的元素内的 html 代码。其中 html() 是 jQuery 里的方法这段代码等同于用 DOM 实现代码： document.getElementById("

3 CSS 定位&浮动

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CSS Position（定位）： static定位：静态定位的元素不会受到top,bottom,left,right影响 Fixed定位: 元素的位置相对于浏览器窗口固定即便串口滚动元素也不滚动注： Fixed 定位在 IE7 和 IE8 下需要描述 !DOCTYPE 才能支持 Fixed定位使元素的位置与文档流无关，因此不占据空间 Fixed定位的元素和其他元素重叠。 p.pos_fixed { position:fixed; top:30px; right:5px; } Relative定位：相对定位元素的定位是相对其正常位置，常被用于绝对定位元素的容器块 Absolute定位：绝对定位的元素相对于最近的已定位父元素，如果没有已定位的父元素，那么它的位置相对于<.html> 注： absolutely定位使元素的位置与文档流无关，因此不占空间 absolutely定位的元素和其他元素重叠 span {display:block;} 来源：博客园作者：原象fxy 链接：https://www.cnblogs.com/ltfxy/p/11484050.html

Change CSS class after scrolling 1000px down

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I want a fixed menu to appear in the left column of my site once the user scrolls 1000px down, but am not very experienced with jQuery/JS. I thought something like this would work but it isn't doing anything: HTML: <div id="menu">[MENU_WILL_GO_HERE]</div> STYLE: #menu{display:none;} JQ: var fixed = false; $(document).scroll(function() { if( $(this).scrollTop() > 100 ) { if( !fixed ) { fixed = true; $('#menu').css({position:'fixed', display:'block'}); } } else { if( fixed ) { fixed = false; $('#menu').css({display:'none'}); } } }); Q: Is there a reason this doesn't work? The code is an

Detect when a div with fixed position crosses over another element

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问题 I'm struggling to find out how to detect when a div with position fixed start and finish to hover a certain div while scrolling. I've a div always in position fixed and centered in my window. While I'm scrolling my page, I would like that the fixed div when starts to hover another one changes its color and remove the color once it finishes to hover. I attached a little schema to illustrate my problem. To resume: The fixed div when page loads has black color -> Starts to hover a second div,

css footer position stick to bottom of browser?

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I'm having a problem with my site http://artygirl.co.uk/pixie/about/ I can't seem to get the footer to automatically stick to the bottom of the browser, and show the rest of my background. Is there a solution better than using position:fixed or absolute? I think there are possibly other styles over-riding some tests I do in firebug. Thanks for your help Regards Judi Steve This is always a bit difficult, you could increase the min-height of your content area, but even then if someone has a really big screen you'd see the same thing. You could use a bit of JavaScript to increase the min-height

Limit Multiple MongoDB Array Size

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问题 I have a document that lists post item ids for an author separated out by topic. This results in a document such as the following: { _id: "sdkafjsadkfjads3023", Author: "SomeGuy" RecentPosts: { "topic-1": { Count: 4, Posts: ["postitemid1","postitemid2","postitemid2","postitemid3"] } "topic-2": { Count: 3 Posts: ["postitem5","postitem6","postitem8"] } } } Most of the time I am doing atomic pushes to each of these post arrays in the same update. What I want to do is limit the arrays above to 10

关于position:fixed和display:table-cell的hack用法

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前言：之前在项目中，经常会遇到左侧的侧边栏能自由伸缩，右边的内容区域能伴随着左边侧边栏的伸缩自由填满宽度，假设右边的内容区域有一个宽度填满右边区域，并且需要固定悬浮在右边区域的底部，如下图一般情况下，要想保证右下角的悬浮区域宽度填满右边区域，并且可以在左边区域伸缩、屏幕伸缩的情况下做自适应，必然要通过js来实现，并且监听浏览器window的resize事件来动态的对其宽度做处理，这几天无意中发现一个方法可以通过纯css的方式来解决这个问题，代码如下； <!DOCTYPE html> < html > < head > < title > fixed-table </ title > < style type = "text/css" > html , body { margin : 0 ; } .left { width : 20 % ; height : 100 % ; background-color : yellow ; position : fixed ; } .right { /*position: relative;*/ width : 80 % ; height : 1800 px ; float : right ; background-color : #aaa ; } .pagination { border : 1 px solid red ;

css “fixed” child element positions relative to parent element not to the viewport, why?

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I'm developing a wordpress theme, with an isotope grid and where a hover on a post should display its title with a fixed position on the bottom of the browser. I have this simplified structure: <div id="main"> <article class="hubbub"> //article content <h2 class="subtitled"> //h2 content </h2> </article> </div> Via jQuery, a hover on <article> should display its child element h2.subtitled . <article> is positioned relative, but gets an absolute position by the isotope script. The h2.subtitled is positioned fixed with: .subtitled { display: none; position: fixed; z-index: 999999999; bottom:

覆盖前端70%的面试题之HTML、CSS篇(一)

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1、怎么让一个不定宽高的 DIV，垂直水平居中？答： 1）使用 CSS 方法：父盒子设置：display：table-cell； text-align：center；vertical-align：middle； Div 设置： display：inline-block；vertical-align：middle； 2）使用 CSS3 transform：父盒子设置：display：relative Div 设置： transform： translate(-50%，-50%)；position： absolute；top： 50%；left： 50%； 3）使用 flex布局：父盒子设置：display：flex；justify-content：center；align-items：center； 4）使用网格布局：父盒子设置：display：grid； Div 设置： justify-self：center；align-self：center； 2、position 几个属性的作用？答： position 的常见四个属性值： relative，absolute，fixed，static。一般都要配合"left"、“top”、“right” 以及 “bottom” 属性使用。 1）Static：默认位置，设置为 static 的元素，它始终会处于页面流给予的位置

Detect when a div with fixed position crosses over another element

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I'm struggling to find out how to detect when a div with position fixed start and finish to hover a certain div while scrolling. I've a div always in position fixed and centered in my window. While I'm scrolling my page, I would like that the fixed div when starts to hover another one changes its color and remove the color once it finishes to hover. I attached a little schema to illustrate my problem. To resume: The fixed div when page loads has black color -> Starts to hover a second div, the color turns to white -> Finish to hover the second div, the color is back to black. I found this

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