bootstrap和bootstrap-select的outline设置

.btn:focus,
.btn:active:focus,
.btn.active:focus,
.btn.focus,
.btn:active.focus,
.btn.active.focus {
　　outline: thin dotted;
　　outline: 5px auto -webkit-focus-ring-color;
　　outline-offset: -2px;
}
input[type="file"]:focus,
input[type="radio"]:focus,
input[type="checkbox"]:focus {
　　outline: thin dotted;
　　outline: 5px auto -webkit-focus-ring-color;
　　outline-offset: -2px;
}
a:focus {
　　outline: thin dotted;
　　outline: 5px auto -webkit-focus-ring-color;
　　outline-offset: -2px;
}
.bootstrap-select .dropdown-toggle:focus {
　　outline: thin dotted #333333 !important;
　　outline: 5px auto -webkit-focus-ring-color !important;
　　outline-offset: -2px;
}

将对应的outline设置为none，可以禁止浏览器出现蓝色边框