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Implementation code of native js segmented animation

小云云Original: 2018-03-12 15:33:081373browse

This article mainly shares with you the implementation code of native js segmented animation, hoping to help everyone.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"><head>
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
    <title>函数的封装(多属性),动画的停止-分段动画</title>
    <style type="text/css">
    * {        margin: 0;        padding: 0;    }

    .box {        width: 100px;        height: 100px;        background-color: #F10250;        margin: 50px;        position: relative;    }
    </style>
    <script type="text/javascript">
    function getStyle(element, styleName) {
        if (element.currentStyle) {            return element.currentStyle[styleName];
        } else {            return window.getComputedStyle(element, null)[styleName];
        }
    }    function animate(element, json, fun) {
        //element.timer的意思是给当前元素添加一个timer属性
        //在这里是添加一个计时器
        clearInterval(element.timer);        var isStop = false;
        element.timer = setInterval(function() {
            for (var key in json) {
                isStop = true;                //通过in循环,获取到的是json中的css属性名key
                //通过json[key],可以获取key属性的值
                var target = json[key];                var current = parseInt(getStyle(element, key));                var setp = (target - current) / 10;                //当current的值是一个大于target的值的时候
                //此时setp是一个小于零的数,此时向上取整为零
                //所以需要判断setp是否大于零,大于零向上取整,小于零向下取整
                setp = setp > 0 ? Math.ceil(setp) : Math.floor(setp);
                current += setp;
                console.log(current);                //只要有一个属性动画没有结束,就不停止动画
                //不能用只要有一个属性动画完成就停止动画的思路,
                //因为此时不是所有属性的动画都已经完成
                //不停止动画
                if (Math.abs(target - current) > Math.abs(setp)) {
                    isStop = false;
                } else {                    //强制将current = target
                    current = target;
                }
                element.style[key] = current + "px";                //停止动画
                if (isStop) {
                    clearInterval(element.timer);                    //添加回调函数
                    //判断传入的是一个函数
                    if (typeof fun == "function") {
                        fun();
                    }
                }
            }
        }, 10);
    }
    window.onload = function() {
        var box = document.getElementsByClassName("box")[0];
        box.onclick = function() {
            animate(box, {
                left: 400,
            }, function() {
                animate(box, {
                    width: 500
                }, function() {
                    animate(box, {
                        height: 500
                    }, null);
                });
            });
        }

    }    </script></head><body>
    <p class="box"></p>
    <p class="hezi" style="background-color: green"></p></body></html

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