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1.setInterval被調(diào)用后，就會被加入到定時器執(zhí)行隊(duì)列中等待綁定的函數(shù)被執(zhí)行，也就是你設(shè)置的interval時間只會有效一次
2.想要實(shí)現(xiàn)你說的功能，請使用setTimeout函數(shù)

function flip(obj){
    var timeout=Math.round(Math.random()*1000+1000);
    clearTimeout(obj.flip);
    obj.flip=setTimeout(function timeoutFun(){
        var oTop=parseInt(getStyle(obj,'top'));
        oTop==0?doMove(obj,'top',10,-100):doMove(obj,'top',10,0);
        timeout=Math.round(Math.random()*1000+1000);
        obj.flip=setTimeout(timeoutFun,timeout);
    },timeout);
}

function flip(obj){
            var timer = 0;//第一次隨便給個時間間隔
            obj.flip=setInterval(function(){
                var oTop=parseInt(getStyle(obj,'top'));
                oTop==0?doMove(obj,'top',10,-100):doMove(obj,'top',10,0);
                timer = Math.round(Math.random()*1000+1000);//后面每次執(zhí)行時都會重新生成一個時間間隔
            },timer)
        }

稍微抽象一下：

function repeatJob(jobFunc, intervalGenerator) {
    var lastTime = 0;
    var interval = 0;
    var seed = 0;

    function loop() {
        var now = new Date();
        if(now - lastTime > interval) {
            lastTime = now;

            interval = intervalGenerator()
            jobFunc();
        }
        seed = requestAnimationFrame(loop)
    }

    return {
        start: function() {
            seed = requestAnimationFrame(loop)
        },
        stop: function() {
            cancelAnimationFrame(seed);
        }
    }
}

function intervalGenerator() {
    return Math.round(Math.random()*1000+1000);
}

function job() {
    console.log('this job repeats');
    var oTop=parseInt(getStyle(obj,'top'));
    oTop==0?doMove(obj,'top',10,-100):doMove(obj,'top',10,0);
}

var r = repeatJob(job, intervalGenerator);
r.start();
//r.stop();