格式化当前日期

Date.prototype.format = function(format) //author: meizz{var o = {"M+" : this.getMonth()+1, //month"d+" : this.getDate(), //day"h+" : this.getHours(), //hour"m+" : this.getMinutes(), //minute"s+" : this.getSeconds(), //second"q+" : Math.floor((this.getMonth()+3)/3), //quarter"S" : this.getMilliseconds() //millisecond}if(/(y+)/.test(format)) format=format.replace(RegExp.$1,(this.getFullYear()+"").substr(4 - RegExp.$1.length));for(var k in o)if(new RegExp("("+ k +")").test(format))format = format.replace(RegExp.$1,RegExp.$1.length==1 ? o[k] :("00"+ o[k]).substr((""+ o[k]).length));return format;}alert(new Date().format("yyyy-MM-dd"));