Javascript计数器，点击特定数字后弹出模式

Question

>我目前有以下代码，我想知道如何在它命中 200000 后出现一个弹出模式，停止计数器而不仅仅是继续 500000 数字。

<div class="available-credits" id="value">500000</div>
function animateValue(obj, start = 0, end = null, duration = 600000) {
    if (obj) {
        var textStarting = obj.innerHTML;
        end = end || parseInt(textStarting.replace(/D/g, ""));
        var range = end - start;
        var minTimer = 50;
        var stepTime = Math.abs(Math.floor(duration / range));
        stepTime = Math.max(stepTime, minTimer);
        var startTime = new Date().getTime();
        var endTime = startTime + duration;
        var timer;
        function run() {
            var now = new Date().getTime();
            var remaining = Math.max((endTime - now) / duration, 0);
            var value = Math.round(end - (remaining * range));
            obj.innerHTML = textStarting.replace(/([0-9]+)/g, value);
            if (value == end) {
                clearInterval(timer);
            }
        }
        timer = setInterval(run, stepTime);
        run();
    }
}
animateValue(document.getElementById('value'));

Answer 1

返回是你用来打破这种情况的。您可以使用一些数学来估计下一个迭代值，并使其更精确。

<div class="available-credits" id="value">500000</div>
function animateValue(obj, start = 0, end = null, duration = 600000, limit = 10000) {
    if (obj) {
        var textStarting = obj.innerHTML;
        end = end || parseInt(textStarting.replace(/D/g, ""));
        var range = end - start;
        var minTimer = 50;
        var stepTime = Math.abs(Math.floor(duration / range));
        stepTime = Math.max(stepTime, minTimer);
        var startTime = new Date().getTime();
        var endTime = startTime + duration;
        var timer;
        function run() {
            var now = new Date().getTime();
            var remaining = Math.max((endTime - now) / duration, 0);
            var value = Math.round(end - (remaining * range));
            obj.innerHTML = textStarting.replace(/([0-9]+)/g, value);
            if(value >= limit)
            {
                    obj.innerHTML = limit;//cheat
                    clearInterval(timer);
                return;
            }
            if (value == end) {
                clearInterval(timer);
            }
        }
        timer = setInterval(run, stepTime);
        run();
    }
}
animateValue(document.getElementById('value'));