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如图,在<body class="container">内包含若干个<div class="col-md-“1-12数字”">col-md-“1-12数字”></div>效果是
把整个col向右边偏移,在源码实现上,.col-尺寸大小-offset-x 就是margin-left:8.33333333333...*x;
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< div class = "col-md-8 col-md-offset-2" >col-md8</ div > |
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< div class = "col-md-8" >col-md8</ div > < div class = "col-md-3 col-md-offset-1" >col-md3</ div > |
栅格系统的col是可以针对父级的row进一步再进行百分比的划分,比如说:
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< div class = "row" > < div class = "col-sm-12" >我是整行< br > < div class = "col-sm-6" >我是一半 < div class = "row" > < div class = "col-sm-6" >我是6/12*6/12=1/4</ div > </ div > </ div > < div class = "col-sm-6" ></ div > </ div > </ div > |
强行把当前列向左或者向右推拉
只有两个语句:col-尺寸大小-push-*()和col-尺寸大小-pull-*()
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< div class = "row" > < div class = "col-sm-3 col-sm-push-6" style = "background: #abc" >col3</ div > </ div > |
col3被强行推了6格。同理<
div
class
=
"col-sm-3 col-sm-pull-1"
style
=
"background: #abc"
>col3</
div
>是向左拉了一格。
效果相当于绝对定位。在源码实现上,也是做定位:
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.col-md-pull -8 { right : 66.66666666666666% ;} |
看起来12列栅格布局实现得很死板,但是组合屏幕尺寸,方案就非常多了
比如我要为自己的网页做一适配小屏和中屏的版本,可以把类叠加到class上。
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< div class = "col-sm-6 col-md-3" style = "background: #abc" >col3</ div > |
到了小屏,表现为1/2
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< div class = "col-xs-3" style = "background: #abc" >col3</ div > |
到了大屏,依然占25%。
结论:屏幕尺寸向大兼容。向小肯定不兼容!
情景:在小屏幕上一行显示4个col3,在超小屏幕上一行显示2个col6,代码如何实现?
代码应该是这样的
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< div class = "col-xs-6 col-sm-3" style = "background: #abc" >col</ div > < div class = "col-xs-6 col-sm-3" style = "background: #abc" >col</ div > < div class = "col-xs-6 col-sm-3" style = "background: #abc" >col</ div > < div class = "col-xs-6 col-sm-3" style = "background: #abc" >col</ div > |
看起来也没问题。
如果把第一个div改为
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< div class = "col-xs-6 col-sm-3" style = "background: #abc" >col< br >我胖了</ div > |
效果不佳。
这时应该加一个清除浮动的div到第2/3个div之间第四个就不会飘上去了
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< div class = "col-xs-6 col-sm-3" style = "background: #abc" >col< br >我胖了</ div > < div class = "col-xs-6 col-sm-3" style = "background: #abc" >col</ div > < div class = "clearfix visible-xs" ></ div > < div class = "col-xs-6 col-sm-3" style = "background: #abc" >col</ div > < div class = "col-xs-6 col-sm-3" style = "background: #abc" >col</ div > |
class="clearfix visible-xs",前者表示清除浮动,后者表示在超小屏生效
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< div class = "row" > < div class = "col-sm-5 col-md-6" >.col-sm-5 .col-md-6</ div > < div class = "col-sm-5 col-sm-offset-2 col-md-6 col-md-offset-0" >col-sm-5 col-sm-offset-2 col-md-6 col-md-offset-0 </ div > </ div > < div class = "row" > < div class = "col-sm-6 col-md-5 col-lg-6" >.col-sm-6 .col-md-5 .col-lg-6</ div > < div class = "col-sm-6 col-md-5 col-md-offset-2 col-lg-6 col-lgoffset-0" >col-sm-6 col-md-5 col-md-offset-2 col-lg-6 col-lgoffset-0</ div > </ div > |
布置类似这样的代码,可以很快实现不同设备宽度下的样式。
作者认为bootstrap的代码重复率相当之高。
作者把 bootstrap的CSS组件内容总结为8类
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< div class = "progress progress-striped active" > < div class = "progress-bar" style = "width: 45%" > < span class = "sr-only" >45% Complete</ span > </ div > </ div > |
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.progress.active .progress-bar { -webkit-animation: progress-bar-stripes 2 s linear infinite; /* 2秒过度40像素,无限循环 */ animation: progress-bar-stripes 2 s linear infinite; /* 其他浏览器 */ } |
最后,需要说明,顺序很重要。否则样式大乱套。
基本规则
(1)布局规则——基于元素自定义属性
(2)js实现步骤——向jQuery看齐
(3)可以是js声明,也可以是js调用
js会检测到html中相应的属性,自动绑定事件,而无需额外的js代码。
比如说
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<div class= "btn-group" > <button type= "button" class= "btn btn-default dropdown-toggle" data-toggle= "dropdown" > 我的书籍 <span class= "caret" ></span> </button> <ul class= "dropdown-menu" > <li><a href= "#" >JavaScript编程精解</a></li> <li><a href= "#" >JavaScript设计模式</a></li> <li><a href= "#" >JavaScript启示录</a></li> <li class= "divider" ></li> <li><a href= "#" >深入理解Bootstrap3</a></li> </ul> </div> |
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< ul class = "nav nav-tabs" id = "myTab" > < li class = "active" >< a data-toggle = "tab" href = "#home" >首页</ a ></ li > < li class = "" >< a data-toggle = "tab" href = "#profile" >个人资料</ a ></ li > < li class = "dropdown" > <!-- 单击"我的书籍"时,弹出下拉菜单 --> < a data-toggle = "dropdown" href = "#" class = "dropdown-toggle" > 我的书籍 < b class = "caret" ></ b > </ a > < ul class = "dropdown-menu" > < li >< a data-toggle = "tab" href = "#dropdown1" >JavaScript编程精解</ a ></ li > < li >< a data-toggle = "tab" href = "#dropdown2" >JavaScript设计模式</ a ></ li > < li >< a data-toggle = "tab" href = "#dropdown3" >JavaScript启示录</ a ></ li > < li >< a data-toggle = "tab" href = "#dropdown4" >深入理解Bootstrap</ a ></ li > </ ul > </ li > </ ul > < div class = "tab-content" id = "myTabContent" > < div id = "home" class = "tab-pane fade active in" > < p >单击"首页"时显示该区域</ p > </ div > < div id = "profile" class = "tab-pane fade" > < p >单击"个人资料"时显示该区域</ p > </ div > < div id = "dropdown1" class = "tab-pane fade" > < p >单击"JavaScript编程精解"时显示该区域</ p > </ div > < div id = "dropdown2" class = "tab-pane fade" > < p >单击"JavaScript设计模式"时显示该区域</ p > </ div > < div id = "dropdown3" class = "tab-pane fade" > < p >单击"JavaScript启示录"时显示该区域</ p > </ div > < div id = "dropdown4" class = "tab-pane fade" > < p >单击"深入理解Bootstrap3"时显示该区域</ p > </ div > </ div > |
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原文地址:http://www.cnblogs.com/djtao/p/5942670.html