去掉bootstrap表单空间获得焦点时四周的闪光阴影

方法: 自定义css style, 覆盖bootstrap的设置:

.form-control:focus,
.has-success .form-control:focus,
.has-warning .form-control:focus,
.has-error .form-control:focus {
    -webkit-box-shadow: none;
    box-shadow: none;
}