js时间戳转为日期函数

    function add0(m){
        return m<10?‘0‘+m:m;
    }

    //timestamp参数示例：1501234567
    function format(timestamp){
        //timestamp是整数，否则要parseInt转换,不会出现少个0的情况
        var time = new Date(timestamp*1000); //Date构造函数需要传的时间戳要精确到毫秒，所以乘以1000
        var year = time.getFullYear();
        var month = time.getMonth()+1;
        var date = time.getDate();
        var hours = time.getHours();
        var minutes = time.getMinutes();
        var seconds = time.getSeconds();
        return year+‘-‘+add0(month)+‘-‘+add0(date)+‘ ‘+add0(hours)+‘:‘+add0(minutes)+‘:‘+add0(seconds);
    }