bootstrap2和3的区别是什么
区别：1、Bootstrap3支持移动端优先，Bootstrap没有；2、Bootstrap2采用渐变凹凸风格，Bootstrap3采用扁平化设计风格；3、bootstrap3的浏览器兼容性方面比Bootstrap2好。
相关教程推荐：《bootstrap教程》
做项目时，有时也会参考别的案例的优秀之处。在用Bootstrap的时候，发现很多项目代码都有区别，在
布局class上，有用.span*，有用.col-md-*，实际上是Bootstrap版本升级，语法也变了。
Bootstrap3中被修改的样式
| Bootstrap 2.x | Bootstrap 3.x |
|---|---|
.container-fluid | .container |
.row-fluid | .row |
.span* | .col-md-* |
.offset* | .col-md-offset-* |
.brand | .navbar-brand |
.nav-collapse | .navbar-collapse |
.nav-toggle | .navbar-toggle |
.btn-navbar | .navbar-btn |
.hero-unit | .jumbotron |
.icon-* | .glyphicon .glyphicon-* |
.btn | .btn .btn-default |
.btn-mini | .btn-xs |
.btn-small | .btn-sm |
.btn-large | .btn-lg |
.alert-error | .alert-danger |
.visible-phone | .visible-xs |
.visible-tablet | .visible-sm |
.visible-desktop | 分成了 .visible-md .visible-lg |
.hidden-phone | .hidden-xs |
.hidden-tablet | .hidden-sm |
.hidden-desktop | 分成了 .hidden-md .hidden-lg |
.input-small | .input-sm |
.input-large | .input-lg |
.control-group | .form-group |
.checkbox.inline .radio.inline | .checkbox-inline .radio-inline |
.input-prepend .input-append | .input-group |
.add-on | .input-group-addon |
.img-polaroid | .img-thumbnail |
ul.unstyled | .list-unstyled |
ul.inline | .list-inline |
.muted | .text-muted |
.label | .label .label-default |
.label-important | .label-danger |
.text-error | .text-danger |
.table .error | .table .danger |
.bar | .progress-bar |
.bar-* | .progress-bar-* |
.accordion | .panel-group |
.accordion-group | .panel .panel-default |
.accordion-heading | .panel-heading |
.accordion-body | .panel-collapse |
.accordion-inner | .panel-body |
Bootstrap3.x中新增的样式
| 页面元素 | 描述 |
|---|---|
| Panels | .panel .panel-default .panel-body .panel-title .panel-heading.panel-footer.panel-collapse |
| List groups | .list-group .list-group-item .list-group-item-text.list-group-item-heading |
| Glyphicons | .glyphicon |
| Jumbotron | .jumbotron |
| Extra small grid (<768px) | .col-xs-* |
| Small grid (≥768px) | .col-sm-* |
| Medium grid (≥992px) | .col-md-* |
| Large grid (≥1200px) | .col-lg-* |
| Responsive utility classes (≥1200px) | .visible-lg .hidden-lg |
| Offsets | .col-sm-offset-* .col-md-offset-* .col-lg-offset-* |
| Push | .col-sm-push-* .col-md-push-* .col-lg-push-* |
| Pull | .col-sm-pull-* .col-md-pull-* .col-lg-pull-* |
| Input groups | .input-group .input-group-addon .input-group-btn |
| Form controls | .form-control .form-group |
| Button group sizes | .btn-group-xs .btn-group-sm .btn-group-lg |
| Navbar text | .navbar-text |
| Navbar header | .navbar-header |
| Justified tabs / pills | .nav-justified |
| Responsive images | .img-responsive |
| Contextual table rows | .success .danger .warning .active |
| Contextual panels | .panel-success .panel-danger .panel-warning .panel-info |
| Modal | .modal-dialog .modal-content |
| Thumbnail image | .img-thumbnail |
| Well sizes | .well-sm .well-lg |
| Alert links | .alert-link |
Bootstrap3.x中被移除的样式
| 页面元素 | 从2.x版本中去除 | 3.x版本中对应的元素 |
|---|---|---|
| Form actions | .form-actions | N/A |
| Search form | .form-search | N/A |
| Form group with info | .control-group.info | N/A |
| Fluid container | .container-fluid | .container (不再进行固定) |
| Fluid row | .row-fluid | .row (不再进行固定) |
| Controls wrapper | .controls | N/A |
| Controls row | .controls-row | .row 或者.form-group |
| Navbar inner | .navbar-inner | N/A |
| Navbar vertical dividers | .navbar .divider-vertical | N/A |
| Dropdown submenu | .dropdown-submenu | N/A |
| Tab alignments | .tabs-left .tabs-right.tabs-below | N/A |
| Nav lists | .nav-list .nav-header | 没有直接对等的样式t, 但是和List groups 和 .panel-groups相似 |
且
自Bootstrap3起，框架包含了贯穿于整个库的移动设备优先的样式。
bootstrap3的浏览器兼容性方面比Bootstrap2好
如果你需要兼容IE8甚至是IE7和IE6，那么只能选择Bootstrap2，虽然它自身在IE6的效果也并不完美。
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