/*：这只是演示代码。源码下载链接: http://www.bootstrapmb.com/item/490(这个说明仅在演示里会看到,下载的源码里没有)*//** * Nestable */.dd { position: relative; display: block; margin: 0; padding: 0; max-width: 600px; list-style: none; font-size: 13px; line-height: 20px; }.dd-list { display: block; position: relative; margin: 0; padding: 0; list-style: none; }.dd-list .dd-list { padding-left: 30px; }.dd-collapsed .dd-list { display: none; }.dd-item,.dd-empty,.dd-placeholder { display: block; position: relative; margin: 0; padding: 0; min-height: 20px; font-size: 13px; line-height: 20px; }.dd-handle { display: block; height: 30px; margin: 5px 0; padding: 5px 10px; color: #6F7B8A; text-decoration: none; font-weight: bold; border: 1px solid #e5e9ec;    background: #fff;    -webkit-border-radius: 3px;            border-radius: 3px;    box-sizing: border-box; -moz-box-sizing: border-box;}.dd-handle:hover {  background-color: #fbfcfd; }.dd-item >button { display: block; position: relative; cursor: pointer; float: left; width: 25px; height: 20px; margin: 5px 0; padding: 0; text-indent: 100%; white-space: nowrap; overflow: hidden; border: 0; background: transparent; font-size: 12px; line-height: 1; text-align: center; font-weight: bold; }.dd-item >button:before { content: '+'; display: block; position: absolute; width: 100%; text-align: center; text-indent: 0; }.dd-item >button[data-action="collapse"]:before { content: '-'; }.dd-placeholder,.dd-empty { margin: 5px 0; padding: 0; min-height: 30px; background: #f2fbff; border: 1px dashed #b6bcbf; box-sizing: border-box; -moz-box-sizing: border-box; }.dd-empty { border: 1px dashed #bbb; min-height: 100px; background-color: #e5e5e5;    background-image: -webkit-linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff),                       -webkit-linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff);    background-image:    -moz-linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff),                          -moz-linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff);    background-image:         linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff),                               linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff);    background-size: 60px 60px;    background-position: 0 0, 30px 30px;}.dd-dragel { position: absolute; pointer-events: none; z-index: 9999; }.dd-dragel >.dd-item .dd-handle { margin-top: 0; }.dd-dragel .dd-handle {    -webkit-box-shadow: 2px 4px 6px 0 rgba(0,0,0,.1);            box-shadow: 2px 4px 6px 0 rgba(0,0,0,.1);}/** * Nestable Extras */.nestable-lists { display: block; clear: both; padding: 0; width: 100%; border: 0; }#nestable-menu { padding: 0; margin: 20px 0; }#nestable-output,#nestable2-output { width: 100%; height: 7em; font-size: 0.75em; line-height: 1.333333em; font-family: Consolas, monospace; padding: 5px; box-sizing: border-box; -moz-box-sizing: border-box; }.dark .dd-handle {   color: #6F7B8A;    border: none;    background: #d9e0e4;}.dark  .dd-handle:hover { background: #d1dade;color: #505458; }.dark  .dd-item >button:before {color: #8E9AA2; }@media only screen and (min-width: 700px) {     .dd { float: left; width: 48%; }    .dd + .dd { margin-left: 2%; }}.dd-hover >.dd-handle { background: #2ea8e5 !important; }/** * Nestable Draggable Handles */.dd3-content { display: block; height: 30px; margin: 5px 0; padding: 5px 10px 5px 40px; color: #333; text-decoration: none; font-weight: bold; border: 1px solid #ccc;    background: #fafafa;    background: -webkit-linear-gradient(top, #fafafa 0%, #eee 100%);    background:    -moz-linear-gradient(top, #fafafa 0%, #eee 100%);    background:         linear-gradient(top, #fafafa 0%, #eee 100%);    -webkit-border-radius: 3px;            border-radius: 3px;    box-sizing: border-box; -moz-box-sizing: border-box;}.dd3-content:hover { color: #2ea8e5; background: #fff; }.dd-dragel >.dd3-item >.dd3-content { margin: 0; }.dd3-item >button { margin-left: 30px; }.dd3-handle { position: absolute; margin: 0; left: 0; top: 0; cursor: pointer; width: 30px; text-indent: 100%; white-space: nowrap; overflow: hidden;    border: 1px solid #aaa;    background: #ddd;    background: -webkit-linear-gradient(top, #ddd 0%, #bbb 100%);    background:    -moz-linear-gradient(top, #ddd 0%, #bbb 100%);    background:         linear-gradient(top, #ddd 0%, #bbb 100%);    border-top-right-radius: 0;    border-bottom-right-radius: 0;}.dd3-handle:before { content: '≡'; display: block; position: absolute; left: 0; top: 3px; width: 100%; text-align: center; text-indent: 0; color: #fff; font-size: 20px; font-weight: normal; }.dd3-handle:hover { background: #ddd; }/*：这只是演示代码。源码下载链接: http://www.bootstrapmb.com/item/490(这个说明仅在演示里会看到,下载的源码里没有)*/