js 格式化string日期格式

<script type="text/javascript">
/**
 * string 转时间格式;
 */

function formatDate(date, format) {
    if (date.length==0) return;
    if (!format) format = "yyyy-MM-dd";
    switch(typeof date) {
        case "string":
            date = new Date(date.replace(/-/, "/"));
            break;
        case "number":
            date = new Date(date);
            break;
    }
    if (!date instanceof Date) return;
    var dict = {
        "yyyy": date.getFullYear(),
        "M": date.getMonth() + 1,
        "d": date.getDate(),
        "H": date.getHours(),
        "m": date.getMinutes(),
        "s": date.getSeconds(),
        "MM": ("" + (date.getMonth() + 101)).substr(1),
        "dd": ("" + (date.getDate() + 100)).substr(1),
        "HH": ("" + (date.getHours() + 100)).substr(1),
        "mm": ("" + (date.getMinutes() + 100)).substr(1),
        "ss": ("" + (date.getSeconds() + 100)).substr(1)
    };
    return format.replace(/(yyyy|MM?|dd?|HH?|ss?|mm?)/g, function() {
        return dict[arguments[0]];
    });
}   

$(function(){

	$("#otherPublishDate").html(formatDate("2010-04-30", "yyyy年MM月dd"));

	});
</script>