position | 易学教程

position:relative的用法

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position:relative 日常应用的时候一般是设置给 position:absolute; 的父层的, 父层 position:relative; 子层 position:absolute ;的话, 就是依照父层的边界进行定位的, 不然 position:absolute 会逐层向上寻找设置了 position:relative 的元素边界, 直到 body 元素… 比如要实现商品细节图展示的效果，可以使用如下的方法，这个例子很好的解释了position方法的使用。这个页面中，右侧大的图片所在的 div class="big "需要设置 absolute 的绝对定位，那它的父元素 .box 就必须设置 relative 相对定位。左侧小图中的红色方块需要随着鼠标移动，因此也需要设置absolute的绝对定位。那么它的父元素 .small 就必须设置 relative 相对定位。右侧div中的大图片需要随鼠标移动，因此它也需要设置 absolute 绝对定位，而它的父元素 .big 已经是 absolute 绝对定位了，因此大图片的定位是相对 .big 来的。大图片的坐标（0,0）的位置在右侧div的左上角的位置。图中红色方块的移动方向和大图片的移动方向是相反并且成比例的。大图片的移动距离是方块移动距离的倍数。 < style type = " text/css

CSS Position using center of element to position element using percentage

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问题 Hi so I was making a website and I just realized that it when I want to position the html element, it will position the element using the right side of it. Here's an example of what I mean. I was trying to position an image in the center using percentages. Trimmed down version of my css code: .image{position:absolute;right:50%; So when I loaded the website, it shows up with the right corner of the picture at 50%, not the center of the image at 50%. Is there anyway to position using center of

I don't understand absolute and relative positioning in CSS [closed]

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问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 4 months ago . body { margin: 0; } .wrap { width: 800px; height: 1000px; position: relative; margin: auto; background: #e3e3e3; } .box { width: 400px; height: 400px; margin: auto; background: red; position: absolute; left: 20px; top: 30px; } I have a little markup and some css which i'm

JFrame's position and pack() in Awesome WM [closed]

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问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 8 years ago . every time when I call pack() method on JFrame, it moves to the initial position where was when started. When I try to get the location of the JFrame

Cytoscape position ignored if locked: false

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问题 When I add a position property on a node, it is ignored unless I also specify locked: true. I would like to specify initial positions on some nodes, yet still allow the user to move those nodes around. Related (I think) - is there a way to let Cytoscape use a layout to determine node positions, then do a second pass and change them for any nodes that have a position property specified? It would also work to have the layout ignore or not process any nodes that have positions specified. That's

why does a Body Tag shift if you have a child with a top margin

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问题 I have spent a good chunk of my time to figure this out. In case you have a div with some margin on the top. The body position as per the chrome dev tools start from the point where the div starts from. Basically it doesn't consider the margin for the offset. Though it does considers the same for height calculation. Eg - <body> <div> my content my content my content my content my content my content my content my </div> </body> I have created a jsFiddle for the same -- http://jsfiddle.net

微信小程序——前端——抵扣券、优惠券样式

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微信小程序——前端——抵扣券、优惠券样式效果图：实现思路：左边+划线+右边==使用信息+分割线+使用限制整体底色： .wrapper { margin: 0 auto; width: 100%; display: flex; background:linear-gradient(-90deg,rgba(250,173,82,1),rgba(254,50,103,1)); /*实现颜色渐变 */ } /*几个伪类化成的圆弧的样式以及位置（置于顶部）*/ .content:before, .tip:before, .split-line:before{ border-radius: 0 0 16rpx 16rpx; top: 0; } .content:after, .tip:after, .split-line:after{ border-radius: 16rpx 16rpx 0 0; bottom: 0; } 左边： /*前半部分样式*/ .content { position: relative; flex: 1; padding: 20rpx; text-align: left; white-space: nowrap; display: flex; flex-direction: column; justify-content: space-around; } /

vue图表点击联动展示z-tree&echarts

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1.点击表格展示对应扇形统计图，效果如下： 2.统计图组件Statistics .vue代码如下： <template> <div> <div :id="idname" :style="{width: '100%', height: allheight+ 'px'}"></div> </div> </template> <script> export default { name: 'Statistics', props: { statitle: { type: String }, idname: { type: String }, signlist: { type: Array }, colorlist: { type: Array }, showDatalist: { type: Array }, staradios: { type: String }, subtext: { type: String }, legendbottom: { type: Number }, allheight: { type: Number } }, mounted () { this.refreshpic() }, watch: { showDatalist: function (nval, oval) { this.refreshpic() } }, methods: { refreshpic

css重点知识和bug解决方法

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1.图片向下撑大3像素问题在一个盒子里面放一张图片，默认情况下，图片会向下撑大3像素，有以下几种解决方法： 1.1 给图片添加display : block； 1.2 给图片添加 float : left； 1.3 给图片添加 vertical-align : middle ; 1.4 给他的父元素加font-size：0； 2.如何实现一张未知宽高的图片在一个盒子里面做水平垂直居中？给父元素添加宽高，添加行高添加 text-align：center 给图片添加：vertical-align：center 3.元素的类型分类哪几种？各自都有什么特点？块元素独占一行，竖着排，能设置宽高行内元素默认情况下文本一行显示，不能设置宽高行内块状元素 inline-block,既有行内元素的特点又有块状元素的特点可变元素添加float：left 相当于display：block 4.如何实现一个元素消失和出现？ display：none display：block opcity : 0 ; opcity : 1 ; 5.单行文本溢出显示省略号怎么实现？添加width； white-space：nowrap； overflow：hidden； text-overflow：ellipsis； 6.定位的属性值有哪几个？分别有什么特点？ position : absolute

What does top: 50%; actually do on relatively positioned elements? [closed]

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问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . I've been using relatively positioned elements to center things vertically for a while. I never understood, though, why position: relative; top: 50%; doesn't vertically center the element, or at least center the top edge of the element in it's container div. position: relative according to MDN: lays out all

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