我有一个jQuery UI Datepicker，它没有显示prev next图标。我试过但我找不到解决方案。
/* states and images */
.ui-icon { width: 16px; height: 16px; background-image: url(images/ui-icons_222222_256x240.png)/*{iconsContent}*/; }
.ui-widget-content .ui-icon {background-image: url(images/ui-icons_222222_256x240.png)/*{iconsContent}*/; }
.ui-widget-header .ui-icon {background-image: url(images/ui-icons_222222_256x240.png)/*{iconsHeader}*/; }
.ui-state-default .ui-icon { background-image: url(images/ui-icons_888888_256x240.png)/*{iconsDefault}*/; }
.ui-state-hover .ui-icon, .ui-state-focus .ui-icon {background-image: url(images/ui-icons_454545_256x240.png)/*{iconsHover}*/; }
.ui-state-active .ui-icon {background-image: url(images/ui-icons_454545_256x240.png)/*{iconsActive}*/; }
.ui-state-highlight .ui-icon {background-image: url(images/ui-icons_2e83ff_256x240.png)/*{iconsHighlight}*/; }
.ui-state-error .ui-icon, .ui-state-error-text .ui-icon {background-image: url(images/ui-icons_cd0a0a_256x240.png)/*{iconsError}*/; }