JS把格林威治时间转换为北京标准时间

1function fermitTime(time){
2var now = new Date(time);
3var year = now.getFullYear();
4var mon = now.getMonth()+1;
5var date= now.getDate();
6if(mon<10){
7mon = '0'+mon;
8};
9if(date<10){
10date = '0'+date;
11}
12var postDate = year+'-'+mon+'-'+date;
13return postDate;
14}
15
16
17
18alert(fermitTime(‘格林威治时间字符串’));