var d=$.Deferred();

    //deferred下面的方法有:

    // ["resolve", "resolveWith", "reject", "rejectWith", "notify", "notifyWith",

    // "state", "always", "then", "promise", "pipe", "done", "fail", "progress"]

    console.info(Object.keys(d));

    console.info(d.pipe== d.then);//true

    console.info(d.state());//初始化pending状态

    //------------resolve对应的是done------------

    function fn1(){

        var def= $.Deferred();

        setTimeout(function(){

            def.resolve('成功了!');

        },1000);

        return def.promise();

    }

    fn1().done(function(data){

        console.info(data);//成功了!

    });

    //或者可以这样写

    fn1().then(function(data){ //then的参数为( fnDone, fnFail, fnProgress)

        console.info(data);//成功了!

    });

    //------------reject对应的是fail------------

    function fn2(){

        var def= $.Deferred();

        setTimeout(function(){

            def.reject('失败了!');

        },1000);

        return def.promise();

    }

    fn2().fail(function(data){

        console.info(data);//失败了!

    });

    //或者可以这样写

    fn2().then(function(data){ //then的参数为( fnDone, fnFail, fnProgress)

        //不会走

    },function(data){

        console.info(data);

    });

    //------------notify对应的是progress------------

    function fn3(){

        var def= $.Deferred();

        setTimeout(function(){

            def.notify('传递给下一步回调的通知!');

        },1000);

        return def.promise();

    }

    fn3().progress(function(data){

        console.info(data);//传递给下一步回调的通知!

    });

    //或者可以这样写

    fn3().then(function(data){ //then的参数为( fnDone, fnFail, fnProgress)

        //不会走

    },function(data){

        //不会走

    },function(data){

        console.info(data);//传递给下一步回调的通知!

    });

    //------------always 不管成功与否都会执行回调------------

    //deferred.done( arguments ).fail( arguments );

    function fn4(){

        var def= $.Deferred();

        setTimeout(function(){

            Math.random()>0.5?def.resolve('成功!'): def.reject('失败!')

        },1000);

        return def.promise();

    }

    fn4().always(function(data){

        console.info(data);//成功!or失败!

    });

    //------------连续的回调依次执行------------

    /*第一异步程序*/

    function delayFn1(arg1){

        var def= $.Deferred();

        setTimeout(function(){

            var data=arg1+1;

            console.info("第一步--->",data);

            def.resolve(data);

        },1000);

        return def.promise();

    }

    /*第二个异步程序*/

    function delayFn2(arg2){

        var def= $.Deferred();

        setTimeout(function(){

            var data=arg2+1;

            def.resolve(data);

        },1000);

        return def.promise();

    }

    /*第三个异步程序*/

    function delayFn3(arg3){

        var def= $.Deferred();

        setTimeout(function(){

            var data=arg3+1;

            def.resolve(data);

        },1000);

        return def.promise();

    }

    delayFn1(1).then(function(data){

        console.info("第二步--->",data);

        return delayFn2(data)

    }).then(function(data){

        console.info("第三步--->",data);

        return delayFn3(data)

    }).then(function(data){

        console.info("第四步--->",data);

        alert(data);

    })