把日期格式化，解决浏览器日期兼容，

function format(date){
        var week=['日','一','二','三','四','五','六',];
        var y=date.getFullYear()+"年";
        var m=date.getMonth()+1+"月";
        var d=date.getDate()+"日";
        var w=" 星期"+week[date.getDay()];
        //12;00;00.000
        var h=date.getHours();
        var am=h>=12?" 下午":" 上午";
        h=h>12?h-12:h;//24 to 12
        h=h<10?"0"+h:""+h;
        
        var mi=date.getMinutes();
        mi=mi<10?"0"+mi:""+mi;
        
        var s=date.getSeconds();
        s=s<10?"0"+s:""+s;
        return y+m+d+w+am+h+":"+mi+":"+s;
        
    }
    document.write(format(new Date()));