<script>
Date.prototype.format = function(fmt) { 
     var o = { 
        "M+" : this.getMonth()+1,                 
        "d+" : this.getDate(),                    
        "h+" : this.getHours(),                   
        "m+" : this.getMinutes(),                
        "s+" : this.getSeconds(),                 
        "q+" : Math.floor((this.getMonth()+3)/3), 
        "S"  : this.getMilliseconds()             
    }; 
    if(/(y+)/.test(fmt)) {
            fmt=fmt.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length)); 
    }
     for(var k in o) {
        if(new RegExp("("+ k +")").test(fmt)){
             fmt = fmt.replace(RegExp.$1, (RegExp.$1.length==1) ? (o[k]) : (("00"+ o[k]).substr((""+ o[k]).length)));
         }
     }
    return fmt; 
};
</script>

具体用法：

<script>

date=new Date(date).format("yyyy-MM-dd hh:mm:ss");

</script>