offsetWidth所获取的宽度并不是div的实际宽度，它包括div的width、border等。

在JS函数中，可以通过obj.style.width来获取div的实际宽度，但是这种方式style只能获取行间样式，所以需要一个函数调用css中样式，代码如下：

        function getStyle(obj, name) {
            if (obj.currentStyle) {
                return obj.currentStyle[name];
            }
            else {
                return getComputedStyle(obj, false)[name];
            }
        }

        setInterval(function () {
            var oDiv = document.getElementById('div1');

            oDiv.style.width = parseInt(getStyle(oDiv, 'width')) - 1 + 'px';
        }, 30);

现在我们来用一个案例来掩饰去掉offset如何实现

代码：


<!DOCTYPE HTML>
<html>
<head>
    <meta charset="utf-8">
    <title>无标题文档</title>
    <style>
        div {
            width: 200px;
            height: 200px;
            margin: 20px;
            float: left;
            background: yellow;
            border: 10px solid black;
            font-size: 14px;
        }
    </style>
    <script>
        window.onload = function () {
            var oDiv1 = document.getElementById('div1');

            oDiv1.onmouseover = function () {
                startMove(this, 'height', 400);
            };
            oDiv1.onmouseout = function () {
                startMove(this, 'height', 200);
            };

            var oDiv2 = document.getElementById('div2');

            oDiv2.onmouseover = function () {
                startMove(this, 'width', 400);
            };
            oDiv2.onmouseout = function () {
                startMove(this, 'width', 200);
            };

            var oDiv3 = document.getElementById('div3');

            oDiv3.onmouseover = function () {
                startMove(this, 'fontSize', 50);
            };
            oDiv3.onmouseout = function () {
                startMove(this, 'fontSize', 14);
            };

            var oDiv4 = document.getElementById('div4');

            oDiv4.onmouseover = function () {
                startMove(this, 'borderWidth', 100);
            };
            oDiv4.onmouseout = function () {
                startMove(this, 'borderWidth', 10);
            };
        };

        function getStyle(obj, name) {
            if (obj.currentStyle) {
                return obj.currentStyle[name];
            }
            else {
                return getComputedStyle(obj, false)[name];
            }
        }

        function startMove(obj, attr, iTarget) {
            clearInterval(obj.timer);
            obj.timer = setInterval(function () {
                var cur = parseInt(getStyle(obj, attr));

                var speed = (iTarget - cur) / 6;
                speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed);

                if (cur == iTarget) {
                    clearInterval(obj.timer);
                }
                else {
                    obj.style[attr] = cur + speed + 'px';
                }
            }, 30);
        }
    </script>
</head>

<body>
<div id="div1">变高</div>
<div id="div2">变宽</div>
<div id="div3">字体变大</div>
<div id="div4">边框变粗</div>
</body>
</html>


 



运行结果：
　aaarticlea/png;base64,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" alt="" />
												


											
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