cocos2dx-js学习之日期格式转换 Life is but a span.

Date.prototype.format = function(pattern) {
    /*初始化返回值字符串*/
    var returnValue = pattern;
    /*正则式pattern类型对象定义*/
    var format = {
        "y+": this.getFullYear(),
        "M+": this.getMonth()+1,
        "d+": this.getDate(),
        "H+": this.getHours(),
        "m+": this.getMinutes(),
        "s+": this.getSeconds(),
        "S": this.getMilliseconds(),
        "h+": (this.getHours()%12),
        "a": (this.getHours()/12) <= 1? "AM":"PM"
    };
    /*遍历正则式pattern类型对象构建returnValue对象*/
    for(var key in format) {
        var regExp = new RegExp("("+key+")");
        if(regExp.test(returnValue)) {
            var zero = "";
            for(var i = 0; i < RegExp.$1.length; i++) { zero += "0"; }
            var replacement = RegExp.$1.length == 1? format[key]:(zero+format[key]).substring(((""+format[key]).length));
            returnValue = returnValue.replace(RegExp.$1, replacement);
        }
    }
    return returnValue;
};