缓慢放大div

<style> #testzoom{border:1px solid #ccc;background:#eee;} </style> <input type="button" value="test-div" onclick="zoomDiv('testzoom')" /> <div >This is a div</div> <script type="text/javascript"> function $(id){ return document.getElementById(id); } function zoomDiv(id){ var obj = $(id); var changeW = function (){ var obj_w = parseInt(obj.style.width); var obj_h = parseInt(obj.style.height); if (obj_h <= 350 || obj_w < 400) { obj.style.width = (obj_w + Math.ceil((400 - obj_w) / 10)) + 'px'; obj.style.height = (obj_h + Math.ceil((350 - obj_h) / 10)) + 'px'; } else { clearInterval(bw1); } } bw1= setInterval(changeW,1); } </script>

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