当滚动条滚动到页面某个位置时，触发js,

$(window).scroll(function (){

    //window.onload = function() {

        // setup CountUp object

        demo = new CountUp('myTargetElement', 0, 30, 0, 2, options);

        demo1 = new CountUp('yingyong', 0, 100, 0, 2, options);

        demo2 = new CountUp('qiye', 0, 20000, 0, 2, options);

        demo.start();

        demo1.start();

        demo2.start();

        //document.getElementById('version').innerHTML = 'v'+demo.version();            

    });   



$(window).scroll(function (){

    if ($(window).scrollTop()>200) {

        //code........

    }

});

两个例子