Can I $watch whole $data but except some properties?

See the code here:

new Vue({
    el: '#x',
    data: {
        prop1 : '',
        prop2 : '',
        ...
        result : ''
    },
    ready: function(){
        this.$watch('$data', function(){
            this.load(function( xx ){
                // # This will cause '$data change' again, then do 'load' again, infinity looping...
                this.result = xx;
                // /
                // So, can I watch the whole $data but except the 'result'?
            });
        });
    },
    methods: {
        load: function( callback ){
            var self = this;
            doSomeAsync(function( xx ){
                callback.call(self, xx);
            });
        }
    }
});

Did I use it in the right way?

[asip]

http://jsfiddle.net/QdHrN/7/

[Alexorz]

@asip , the key problem: addcalculate is an async function in my case.