[javascript]运动函数

以'px'为单位的运动

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        div {
            width: 100px;
            height: 50px;
            background: red;
            cursor: pointer;
            margin-top: 20px;
            font-size: 14px;
            border: 0 solid #000;
        }
    </style>
</head>
<body>
    <div></div>
    <div></div>
    <div>aaaaaaaaaaaaaa</div>
    <div></div>

    <script>
        function getStyle (obj, attr){
            if (obj.currentStyle) {
                return obj.currentStyle;
            } else {
                return getComputedStyle(obj, false)[attr];
            }
        }

        function startMove (obj, attr, iTarget){
            // var oDiv = document.getElementById("div1");

            clearInterval(obj.timer);

            obj.timer = setInterval(function(){
                var iCur = parseInt(getStyle(obj, attr));

                var iSpeed = (iTarget-iCur)/8;
                iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);

                if (iCur === iTarget) {
                    clearInterval(obj.timer);
                } else {
                    obj.style[attr] = iCur + iSpeed + "px";
                }
            }, 30);
        }

        window.onload = function (){
            var aDiv = document.getElementsByTagName("div");
            var i = 0;

            aDiv[0].onclick = function (){
                startMove(this, 'width', 300);
            }

            aDiv[1].onclick = function (){
                startMove(this, 'height', 200);
            }

            aDiv[2].onclick = function (){
                startMove(this, 'font-size', 100);
            }
            aDiv[3].onclick = function (){
                startMove(this, 'borderWidth', 100);
            }
            
        }
    </script>
</body>
</html>

 

posted @ 2015-07-20 18:59  钟山  阅读(154)  评论(0)  编辑  收藏  举报