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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>throttle</title>
</head>
<body>
    <div style="height:5000px">
        <div id="demo" style="position:fixed;"></div>
    </div>
    <script>
    var COUNT = 0, demo = document.getElementById('demo');
    function testFn() {demo.innerHTML += 'testFN 被调用了 ' + ++COUNT + '次<br>';}
​
    var throttle = function (fn, delay, atleast) {
        var timer = null;
        var previous = null;
​
        return function () {
            var now = +new Date();
​
            if ( !previous ) previous = now;
            if ( atleast && now - previous > atleast ) {
                fn();
                // 重置上一次开始时间为本次结束时间
                previous = now;
                clearTimeout(timer);
            } else {
                clearTimeout(timer);
                timer = setTimeout(function() {
                    fn();
                    previous = null;
                }, delay);
            }
        }
    };
​
    // window.onscroll = throttle(testFn, 200);
    window.onscroll = throttle(testFn, 500, 1000);
​
    </script>
</body>
</html>
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