1.效果样式
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAroAAAEcCAIAAACnMoAgAAAakUlEQVR4nO3d/W8b933Acf8fXjrAKQJbTtbAbNBiw4b1h2K/BQ3abQB/2R+wZSsybEYQZLduCVq7HqCgrdsllsNVtilLlmQ92aQeKJ0ky4rrPFiV7EpOpTB2YssxbUu25Pjxux++x+PxeMcPKVHHk+79wQuOHijKLgXcu587UtvUyO8AAADK2Fb3vwEAAAg5cgEAAAjIBQAAICAXAACAgFwAAAACcgEAAAjIBQAAICAXAACAgFwAAAACcgEAAAjIBQAAICAXAACAgFwAAAACcgEAAAjIBQAAIKg0FwZ7xp9/6/1vvHZg+6tvYw2+8dqB5//7/a6To3V/yAEAqFZFuTDYM66U+u7BHqXUP4zM8+ca/vxh35RS6k//9YDZc6bujzoAAFWRc+Hp8Lndbx3+zsHul/vnvn/qD9/ru4Q1+P6pP7zcP6eUeuGt959kPqj7Aw8AQOXkXHic+eCZH+9TSv117yWs0990XXjmtf0PBibq/sADAFA5ORceDU1uf/Xt7/X+4a96LmGdlFLbX337fj/nIwAAm4mcCw8Hz25/9W2l1F/2XMT6bX/17dX0eN0feAAAKldpLvxF90Wsn94urKTG6v7AAwBQuSq2C3/eNYP1IxcAAJtOpbnw3a6ZNXgpObm2L9yq2C4AADajKrYL3zk5U6XJN3unvl31V21x5AIAYNOpNBde6pyu2tGpYXXljcRH5W+2593WhgMVeHfypc7plzo/evGXrd866ryH0o/4f7Z19IUD/Xu8b9b7Yqvr79/f8MvRb6/hH+6P7QIAYDOqYrsQ65yuxkcvpq8opRZ+9+Gesrc0vlAVzRefxzqnY50X37+lRsad93A5saxGelt3Jz6yP/jiu627DrTuOtC680C6Kacyvfl3EzML6srrB6x3d/1ydE/hTlaaEq0vHM3f7dH+nemv1PKNeHX/ahm5AADYdCrNhT0d09U5/mFTTimlVO7y3x+v5gvHrit1/U3fG1w8nFPDY9N7Oqa/9b+tO3+uTWaUWjib1u8+f2T6PypMkOUb8Y7pPUf6d/68def7MwtKZXry99lzReVmfpi/w6r/+T7YLgAANqMqtgsvtv++vBd+c/y5/XmHZxasY/LSocOFj+86/KFwP6PXlbr+hu/9pw/lVKb7+HP7029c9W6AkQ+cX3X5/WXHR1LZBXVl7/7jz+0/3tDs/I7lZnhU+IdXhVwAAGw6lebCt9p/L3rT5/jtnM8uXS5/Jy+OXlfq2uu/OP7cL8w/K3f/S2+2n921v2d3i30D57sf7v6Fo11syexnjqoofMe5s/ZtXjm7tHA2bb+7d05lRuV/e4XYLgAANqMqtgsvnJiSTd7xT4X7h/sruIfRa0otLywpdWvmB/tbdv7WdYOZppzKjOq3s8Nq6VDHeetTv/1kSN1tsr7F3OFlr7/C8uLfnZhq+HXLN389Ufwdy03+29UGuQAA2HQqzYXn26YqNtd0u+SQe/vLv63wy81rSt1tSk/pcw1D3S3PvjOyu3CDmaacGupueXZf985jU29k1fz5j/Wndme+VCr3RuGW2WG18l5Tapf1tlJXs8+3nd/5TsveBaU+/+Nu53ecnXh2X4v2g4ml+YmU/e6/z6qM6f5LHpxZLK2KgzOL4r+O7QIAYDOqYrvQ0DZVmfOvnFtyHUrnz53bVeGXm9eUuva6fju9uKCUujXz8sGJhrapnQdbduxLvZuzdhVN6amG8Rtq9pOd9jfNZvWd7DrUvWNfy46mmXl15d/2tewoSL2bU/MTqR1NqZf3tew4OJH/juVmyPT4e/6quBh+NbNY4f8+5AIAYNOpNBcqboWphmPn3suVHHJzc68cqz4X2qYa2qZev6rU1az1huv4nb6yoL7ce8z6pplJ6+M/uni/fAFYczXb0DbVMHnHeqNtqqFt6ocfL89/POP87sOT3n9VuxgqbwW2CwCAzaj224Wd7XPzjoNx/hi/9F77+bXlQrGZQznn/93PZtTSe136m+bcX/V/qR37Wnb059Ty4usfL89//OWwyu3d17JjX2qndZvzz73j3D207NjX8vLE0vxEyvXBHe+MeG5HfjWzWHkrsF0AAGxSNd8unH/l3F2liv8f+eQdpdRChecjqssF/f/+i85ENFinLVp29OfsasnvDLLDSikrGlp2HPy4yfOKyNJZXvxRNU3AdgEAsJXUfLsw17R8x+tgnx2u8Ijrnwu7DnXriw8yk/nNgeOKhKHuwibAWmn4nmLQ0VB0A59b1h65AADYdDbg2oV1mryjlGdw2Fck3HndulkVm4AfXby/cHGukr9A5bdcA7YLAIDNaCOeGYFyyAUAwKYTvu3ClsZ2AQCwGbFdCBq5AADYdNguBIrtAgBgM2K7EDRyAQCw6dRiu9B6ARV6+vTp9lffund69OnwuSDV/ecMALCpVbNdqPexdmuoSy6QEQCA9RBy4enwuQcDE3/y45/tOnKu7gfaLeDp06fP/PhnK6mxuocC6QAAqJxvLthHkYeDZ7/9k/eePn3qOOx9grX55v+ceOknh1bSY08yH9QR0QAAqIpHLriOH4+GJk+3DnzjtZ8/efJk19FzT548aWj9pPDn8U8eP37Mn5X8+eyBE48fP04f719Njz/OfBCwqtKh7j+XAIBQcedC6ZHjcWbyfv/4WPvgS//13jP/8tPt//TfBf+ISj3zzz+N/ee7Ay3pldTYg4GJR0OTwSsTEBQDAKCMolxwHTDsY8mjobOr6fHlU+atnkyue8h2s2sQFcp1D93uzdw7Pfp1/5mHg2frwrMeykRD3X86AQAhUcgFv1bQB5UHAxMrqbHlU+ZS38id3uHbvRnbrR4IbvcO3+kbWT5lrqbHvh44E7wHAxM2Vz24ooFiAACUsnLBsxX0gUQfVO73n7nS1nf5aMdsczu2gMtHO6609a2mx0ujgWIAALh45IKrFR4Onl1Nj3+aPJm7cOnh8j3fXxvNbKp5uHwvd+HSp8mTq+lxvWnwK4a6/4wCAOpum/JpBf1/Oh8Onn0wMHGlrS934VK9D3BM7Sd34eLVtj59hsJeM1AMAACXolwo3Ss8GJj4euDM5aMdj1ZW631oY2o/j1ZW546064sbyuwY6v5jCgCor21+qwW7Fe73n5ltbq/3cY3ZqJltbr/ff8ZVDCwYAABO28RWWE2PkwtbeGab21fT42Ix1P0nFQBQR765YLfCvdQoubCFZ7a5/V5q1C4GcgEAUGpbmdXCanp8JTV297RJLmzhmW1uv3vaXEmNrabHyywY6v6TCgCoI+9c0KuFldTYvdTo8ilyYSvPbHP78inzXmp0JTXGggEA4KmQC6WrBd0KS30j5MIWntnm9qW+EV0MngsGcgEA4J0LztXC7d4MubCFZ7a5/XZvxrlgIBcAAC7bypyJuHvaXOobudUzRC5s4Zltbr/VM7TUN6KvYChzPqLuP6wAgHpx54LrTMSdvuHa5MJ0sjGzqN/YWzzJaY+bLWYardszGzw6F+70DbvOR5ALAABbuVxY6hu53ZvJddc6FxyBsJhpdOYCtRD8zDa361+uvdQ3Qi4AADwVcsF14YI+E3G7N3Oze3CduVBYKDRmFstsF+xIKLmN9bXrPjQypTPb3H6ze1Dngn0+wr58gVwAACg7F0qvc7QvXPiqa6CW2wX/Wcw07k1O61jQ/6UQApjZ5vavugZcly94Xu1Y9x9WAEC9uHPBvs7RvnChZrmQTDYmk8nCTsHeIThWCsnpwnkIciGQsXNBX77gebUjT44AgIgTciHXXZNcmE5aVWAlwHQyOZ1/ezGTzCyqxUxjMuO+kMH3ikimdqNzIddNLgAAfHnngv20iFz30I2T/evLhcVMY3La7gSf7cJ0JrPoc90js6Ez29x+42S/nQv3UqPkAgDAxSMX7GdR6qdFrDsXlFKlx35XGnh9jFwIZOxcsF+sST85glwAANgCzYXFTKPHUx7sMw0lucATIwIYcgEAIKrHdmEx05i/7rFow8B2oR5DLgAARAHkgrVTSE7nlwuN1qWN0/YGwX5xJnIh8CEXAACioLYLTFiHXAAAiMiFqA+5AAAQkQtRH3IBACAiF6I+5AIAQEQuRH3IBQCAiFyI+pALAAARuRD1IRcAACJyIepDLgAARORC1IdcAACIyIWoD7kAABCRC1EfcgEAICIXoj7kAgBAFHgumEbMmngiW7N7ZdY85AIAQBTmXDCNmGG6v6p4HPeRTcQJkDUMuQAAEIU4F7JZMxF33yybiNsN4bo5ubCmIRcAAKIQ54JSqiQPyjRByadcGwlawnvIBQCAKLy5UDj8ZxNx71MRsVjMMD0/b5hF5zJYPfgPuQAAEAWQC37XHfhehaAnm00Y1oHfcUfuDij6Nvo+8gsJcqGiIRcAAKLw5kL+a50rBseVjyW3d+ZCPJElFyoccgEAIAp5LjjvIn/ewTCVqx7ytyEX1jDkAgBAFN5rF5SyjvIJoxAG2UQ8ZhhWGBQlQ+GaSHKhqiEXAACiUOeC82kRenmgP2IasbhhuJ8ykX+XXKhqyAUAgCjMueBIgPxVjtaHTCMWT5iJuH0fzrAgF6oacgEAIApxLmTtHDDt0xGOZz1Yu4Z4Iuu4pfUdDFPxugsVDrkAABCFNxeKG6Dw4golz6G0Nwv2XeubsF2oaMgFAICI30gZ9SEXAAAiciHqQy4AAETkQtSHXAAAiMiFqA+5AAAQkQtRH3IBACAiF6I+5AIAQEQuRH3IBQCAiFyI+pALAAARuRD1IRcAACJyIepDLgAARORC1IdcAACIAs8F+3c/xGI+vwOCCXTIBQCAqB6/Ysrxy56K32PqMOQCAEAUTC6UrBS8h0VDHYZcAACIwnztQiEy4ols0TvWDfK7CWeNFK8u2F2IQy4AAETB5YJplN0seBzXs4l4zDBVNhHXuRBPZPOFYBoxwyzKBcMs/Df/xXHDiBMMwpALAADRVsoF6ybWV1rhYBqc5Cg75AIAQBRoLhQf70v/45oqc0F/zOoSZyE44oEpGXIBACDaOrmQyDeDPgfhuogykeC0hPeQCwAAUWhzoeyTKQzD52RE8RKBp2lWMOQCAEAU2lxQa73U0fC7RoLTEZ5DLgAARFsvF8ySb8mUG3IBACDaMrngXCHkP67/m03EWSz4D7kAABCFORespzpkE/F4wrQWB0W3dG8XlFJF7xTlBMngPeQCAEAU4lxwHOzjhhEvXhy4b5GvgcJrL7hunH+aJeMacgEAIAouF4TfG1FyLDeNwks/x+PxeCJrvdCT9RwIx5eVPCXCfk0oLl0Qh1wAAIjC/DsjmCCGXAAAiMiFqA+5AAAQkQtRH3IBACAiF6I+5AIAQEQuRH3IBQCAiFyI+pALAAARuRD1IRcAACJyIepDLgAARORC1IdcAACIyIWoD7kAABCRC1EfcgEAICIXoj7kAgBAFFAulPvlUrFYLBaryZGPWcOQCwAAUXC5oJT6TX70B+03yIU6DrkAABAFnQv2R/Tb+k+/XDAN12+gNg2/30lduKnnL8ou+fXYTH7IBQCAqG7bBTkXsom4LgDT8DmDUSgH07CLwP4yexyfZEqGXAAAiMK7XTCN/FG/ZMmglLKzwN0SRoLtQlVDLgAARGG9dsGKBdOIxQxD2i6wPljHkAsAAFGguVD5Zws7A8P02S7Yo9cMVjJ4XrlQfOKCKRpyAQAgque1C/bb8rULPhsGKxCskxJ6w5BNxIt3DaUXMzCOIRcAAKI6bBdKr2DwygXHSkHnQjyRVdlE3DCtP61AcK0T4gnTY79ALvgPuQAAEIV0u+CIgLhhxMvkQn7YLqxxyAUAgKhu2wXnjqHslQ368O/9ZMpCFtif93xmBLngP+QCAEAU0u2CUs4NQzyRNX22C/kbGQbbhbUNuQAAEIX0d0bYL9+YP/j75YLzK0qvZPDeRDDOIRcAAKKQ/0ZKqwycL9qk3ys5x+D/2gtsF8oOuQAAEIU8F5gNH3IBACAiF6I+5AIAQEQuRH3IBQCAiFyI+pALAAARuRD1IRcAACJyIepDLgAARORC1IdcAACIyIWoD7kAABCRC1EfcgEAICIXoj7kAgBARC5EfcgFAICIXIj6kAsAABG5EPUhFwAAInIh6kMuAABE5ELUh1wAAIjIhagPuQAAEFWaC18wW3TIBQCAiO1C1IdcAACIyIWoD7kAABCRC1EfcgEAICIXoj7kAgBARC5EfcgFAICIXIj6kAsAABG5EPUhFwAAInIh6kMuAABE5ELUh1wAAIjIhagPuQAAEJELUR9yAQAgIheiPuQCAEBELkR9yAUAgIhciPqQCwAAEbkQ9SEXAACiYHJhOrm3zCSn9a0WM43eN2jMLK7/sMh4D7kAABDVYbuwmGn0Pv4vZhrz5eCc6SS5sIFDLgAARCHLBbYLgQ+5AAAQhSwX2C4EPuQCAEAUslxguxD4kAsAAFHIcoHtQuBDLgAARCHLBbYLgQ+5AAAQhSwX2C4EPuQCAEAUklzwXSywYtjoIRcAAKKQ5ELhU44yyDeE18qBqdWQCwAAURC5UP41HXUQ6DTwzojpJMuFjRtyAQAg4ndGRH3IBQCAiFyI+pALAAARuRD1IRcAACJyIepDLgAARORC1IdcAACIyIWoD7kAABCRC1EfcgEAICIXoj7kAgBARC5EfcgFAICIXIj6kAsAABG5EPUhFwAAInIh6kMuAABE5ELUh1wAAIgCzIVsIh6LJ7KV3MwwVTYR97yxacQMswZ/G8YacgEAIAosF7KJeEwYw1R2LZTkQj4TyIUaD7kAABAFkwtWK/gc5/OF4Lhl8cQTWXJho4ZcAACIgsgF04jFE2b57YKVAKaRP1/BdiGgIRcAAKJAT0ZUsl3IZu0PkgtBDLkAABCF5doF+7oF74knEuTCxgy5AAAQBftEStPwvYDBPWwXAhpyAQAgCjAXTEO+dsFnwWCY5MJGDbkAABAFlAs6FeKGUfLSC6YRc24c7OsY7O2C9RFyYYOGXAAAiAJ6ZoQjEvJPqkx4PrnSNxccd0Yu1HLIBQCAKPAXgS49JVF09C/OhYThvkWZJ1gwaxpyAQAgCvRlmjy2CcoREEWnKdyXOhbuglqo6ZALAAARv2Iq6kMuAABE5ELUh1wAAIjIhagPuQAAEJELUR9yAQAgIheiPuQCAEBELkR9yAUAgIhciPqQCwAAEbkQ9SEXAAAiciHqQy4AAETkQtSHXAAAiMiFqA+5AAAQkQtRH3IBACAiF6I+5AIAQEQuRH3IBQCAKNhcyCbizl9T7XrXGtPgd1QHOOQCAEAURC6YRqyiscrBzoVsIl7udkxNhlwAAIgC2i5kE3HnyqDsAqHkk0UfYPdQ4yEXAACiAHOheAyzEBHFMWEaMcO0NhIln3V1B7PuIRcAAKK6bhdKcqFw2sJxY3JhQ4dcAACIwrpdKP7awtUK5EKth1wAAIhCce1C+VwwjVhRLnClY02HXAAAiILPBX3CQR/zC0sHz5YwDcMsbQlyoaZDLgAARCF8mSadC6bhcaEjuVD7IRcAAKJgcsHvFRTcFzMopfLrh8JLLxTlAblQ6yEXAACiwLcL+a2B+4N2BBTezibi7tdk8vxqZj1DLgAARIFvF1xLBI8nTjq+JP9Rx23ZLdR4yAUAgCiE1y4wgQ65AAAQkQtRH3IBACAiF6I+5AIAQEQuRH3IBQCAiFyI+pALAAARuRD1IRcAACKPXLjff0bnwp2+YXJhy4+dC3f6hnUu3O8/Qy4AAJy8c2ElNWbnwlddA+TCFp7Z5vavugbsXFhJjZELAAAXIRdu9ZALW3x0LtzqIRcAAL7cufBgYELnwt3T5lLfiM6FuSPtj1ZW631cY2o/j+6tzB2xcmGpb+TuaSsXHgxMlOZC3X9YAQD1YuXCE59cuN2budk9uNDSlbtwqd6HNqb2k7twcaGl62b34O3ejGcuPCEXAADOXHic+UDngv3kCJ0Lue6h653puaMduQuXHt//ut4HOKY28/j+17kLl+aOdlzrSOunRSz1jdhPi9C5oFcL5AIAoCgXHg1NOnPBefnC9c70fLJr7kj7bDO2grkj7fPJrmudKeeFC85csM9EkAsAAHcuOK92tC9fuNk9eONk//XO9Jftp6+eOPV5a2/2eM9CS/d8suuPx07+8djJT491fnqs8/LRDoSKflz0YzSf7Fpo6c4e7/m8tffqiVNftp++3pm+cbL/Zveg68IF13WO5AIAYJs+Enhe7eh8saavugYWO9PXOlLOYvjsePdCS7fuBjsdEB76cdGP0WfHi1rhWkdqsTOtn0Jpv0BTmescyQUAiDLvXHCej7CvYHAWwxcnTl1p6/u8tdfuBk0fmRAG9oOiK+Hz1t4rbX1feLXCUt+I60wEuQAAcCrkguf5COcVDHYxXHdEw9UTp6609dnpgLDRj87VE6fsULjembZbwXnVQvkzEeQCAESZdy7YCwb7CgZnMdw42e+MBt0NCC39GNmhcONkv7MV7KsWPFcLXLgAAFB2LvgtGPQpCbsY9FmJm92DdjTobrBd60ghJJyPy6IjFG52D+pzEHYr6NMQrBYAAH58c0EvGJzFYF/HcKtnSG8adDdoN072I4TsB0hXgn7s7OsVXK3gt1ogFwAg4gq5UL4Y7OsYdDToTYMzHRBadiLYGwX9OOrrFSppBXIBACJumxr5XWkulCkG56ZBu9M3rOkDEsLDfmjsB8veKJRpBVYLAACXolxwLRicxeCMBmc36HRAyOlHyq4EZyg4W4HVAgDA0zb9H89isHcMrmjQ3WCngzMgEDbOx0g/avoRdIZCmb0CrQAAUJ65UFoMzmiwu8FOB5s+GiE8XA+Q/cDpx9EOhTKtQC4AAJSdC8qnGDyjwe4GVz0gtJyPl/0gloYCrQAA8LTN+Y5fMbiiwZUO2EScj6ArFGgFAICfba73XQcMz2h47FUPCD/Xw1cmFGgFAICTOxeUVzG4oqFMQCC0/B5Bz4e77j+XAIBQ8cgFzfMoUj4dsFmUeXDr/hMJAAgh31zQyhxXsMXU/WcRABBaQi441f14hpqr+88fAGBTqCIX/NT9mAdR3X/OAACbWg1yAQAAbG3kAgAAEJALAABAQC4AAAABuQAAAAT/D4GhaobDTdZtAAAAAElFTkSuQmCC)
<div class="dropdown">
<button class="btn btn-info" data-toggle="dropdown">
<span class="glyphicon glyphicon-star"></span> 下拉菜单
<span class="caret"></span>
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<ul class="dropdown-menu">
<li class="dropdown-header">操作</li> <!-- 设置标题 -->
<li><a><span class="glyphicon glyphicon-plus"></span> 添加 </a></li>
<li><a><span class="glyphicon glyphicon-trash"></span> 删除</a></li>
<li><a><span class="glyphicon-list-alt"></span> 编辑</a></li>
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