js-时间戳转字符串

    function createTime(v){
    var now = new Date(v);
        var yy = now.getFullYear();      //年
        var mm = now.getMonth() + 1;     //月
        var dd = now.getDate();          //日
        var hh = now.getHours();         //时
        var ii = now.getMinutes();       //分
        var ss = now.getSeconds();       //秒
        var clock = yy + "-";
        if(mm < 10) clock += "0";
        clock += mm + "-";
        if(dd < 10) clock += "0";
        clock += dd + " ";
        if(hh < 10) clock += "0";
        clock += hh + ":";
        if (ii < 10) clock += '0'; 
        clock += ii + ":";
        if (ss < 10) clock += '0'; 
        clock += ss;
     return clock;
    }