Nodejs把接收图片base格式保存为文件存储到服务器上

app.post('/upload', function(req, res){
 //接收前台POST过来的base
 var imgData = req.body.imgData;
 //过滤data:URL
 var baseData = imgData.replace(/^data:image\/\w+;base,/, "");
 var dataBuffer = new Buffer(baseData, 'base');
 fs.writeFile("image.png", dataBuffer, function(err) {
 if(err){
 res.send(err);
 }else{
 res.send("保存成功！");
 }
 });
});