nodejs(四)file System模块 解决Cross device link错误 EXDEV

var fs = require('fs');

/*cross device link
fs.rename('c:\\err.LOG','d:\\err.LOG',function(err){
    console.log(err.code);
});
*/

move('c:\\err.LOG','d:\\err.LOG',function(err){
    if(err) throw err;
});


function move(oldpath,newpath,callback){
    fs.rename(oldpath,newpath,function(err){
        if(err){
            if(err.code === 'EXDEV'){
                copy();
            }else{
                callback(err);
            }
        }else{
            callback();
        }
    });

    function copy(){
        var readStream = fs.createReadStream(oldpath);
        var writeStream = fs.createWriteStream(newpath);
        readStream.on('error',callback);
        writeStream.on('error',callback);
        readStream.on('close',function(){
            fs.unlink(oldpath,callback);
        });    
    }
}