datepicker插件默认为英文，而且格式为：mm/dd/yyyy这种情况，看起来不怎么直观。

修改目标：

1、默认显示为中文 

2、格式为：yyyy年mm月dd日 

需要修改两个地方：

1、更改datas对象， 增加zh-cn语言选项；参见源代码的1419行

var dates = $.fn.datepicker.dates = {
 en: {
 days: ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"],
 daysShort: ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"],
 daysMin: ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa", "Su"],
 months: ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"],
 monthsShort: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"],
 today: "Today",
 clear: "Clear"
 },
 "zh-cn":{
 days: ["星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六", "星期日"],
 daysShort: ["周日", "周一", "周二", "周三", "周四", "周五", "周六", "周日"],
 daysMin: ["日", "一", "二", "三", "四", "五", "六", "日"],
 months: ["一月份", "二月份", "三月份", "四月份", "五月份", "六月份", "七月份", "八月份", "九月份", "十月份", "十一月份", "十二月份"],
 monthsShort: ["一月", "二月", "三月", "四月", "五月", "六月", "七月", "八月", "九月", "十月", "十一月", "十二月"],
 today: "今天",
 clear: "清空"
 }
 };

红色部分为新增部分。

2、修改默认参数，即defaults对象。      

var defaults = $.fn.datepicker.defaults = {
 autoclose: false,
 beforeShowDay: $.noop,
 calendarWeeks: false,
 clearBtn: false,
 daysOfWeekDisabled: [],
 endDate: Infinity,
 forceParse: true,
 format: 'yyyy年mm月dd日',
 keyboardNavigation: true,
 language: 'zh-cn',
 minViewMode: 0,
 multidate: false,
 multidateSeparator: ',',
 orientation: "auto",
 rtl: false,
 startDate: -Infinity,
 startView: 0,
 todayBtn: false,
 todayHighlight: false,
 weekStart: 0
 };

 3、效果如下