ajax跨域上传图片

var data = new FormData();
data.append('file', file);
data.append('app', 'goods');
$.ajax({
url:"http://www.wangh.com/index.php",
dataType:"json",
type:'post',
data:data,
cache: false,
contentType: false,
processData: false,
success:function(res){
console.log('图片上传成功');
console.log('res:'+res);
if(res.code == ){
console.log('上传_ok!');
} else{
console.log('上传_err!');
alert(res.msg);
return false;
}
},error: function () {
console.log('图片上传失败');
alert('图片上传失败');
return false;
}
});

//如果需要设置允许所有域名发起的跨域请求，可以使用通配符 *
header("Access-Control-Allow-Origin: *");$log = $_FILES;
file_put_contents('log.txt',json_encode($log),FILE_APPEND);
$imgname = $_FILES['file']['name'];
$tmp = $_FILES['file']['tmp_name'];
$filepath = './uimg/'.rand(999,100000000000);
file_put_contents('log.txt','img_name:',$filepath.$imgname);
if(move_uploaded_file($tmp,$filepath.$imgname)){
    file_put_contents('log.txt','上传成功',FILE_APPEND);
    $data_result = array(
        'code'      => 0 ,
        'message'   => 'this is ok'
    );
}else{
    file_put_contents('log.txt','上传失败',FILE_APPEND);
    $data_result = array(
        'code'      => 0 ,
        'message'   => 'this is err'
    );
}
echo json_encode($data_result);