Js Get 检测是否404

$.get( "http://img12.360buyimg.com/n1/jfs/t1/207023/2/4302/290376/61613c6eEc2e68f8b/51c92e09054c4001.jpg", function() {
debugger;alert( "success" );
})
.done(function() {
debugger;alert( "second success" );
})
.fail(function(rsp) {
debugger;if(rsp.status==404)alert( "error" );
});