以左上角为定点,放大缩小,该点位置不变。
方法一:
<script type="text/javascript">
//兼容IE和火狐 缩小放大、缩放
function ImageSuofang(args) {
var oImg = document.getElementById("oImg");
if (args) {
oImg.width = oImg.width * 1.1;
oImg.height = oImg.height * 1.1;
}
else {
oImg.width = oImg.width / 1.1;
oImg.height = oImg.height / 1.1;
}
}
</script>
<form id="form1">
<div class="pancontainer" data-orient="center" style="width:320px; height:480px;margin: 5px 300px 0px 400px;border: 1px solid #000;">
<img id="oImg" src="/img/c.jpg" alt="pic"/>
</div>
<input id="btn1" type="button" value="放大" οnclick="ImageSuofang(true)" />
<input id="btn2" type="button" value="缩小" οnclick="ImageSuofang(false)" />
<!-- <input type="button" value="<-Rotate逆时针" name="RotateL" id="RotateL" οnclick="rotateRight('oImg',90);"> -->
</form>
方法二:
CSS编码如下:
#biankuang{height:480px;width:320px;margin: 30px auto;}//加一个border可以看到定点为左上角。
下面是实现图片缩小放大功能的JS代码:
var zoomLevel = 0; var currentWidth = 0; var currentHeight = 0; var originalWidth = 0; var originalHeight = 0; function initial(){ currentWidth = document.myImage.width; currentHeight = document.myImage.height; originalWidth = currentWidth; originalHeight = currentHeight; update(); } function zoomIn(){ document.myImage.width = currentWidth*1.2; document.myImage.height = currentHeight*1.2; zoomLevel = zoomLevel + 1; update(); } function zoomOut(){ document.myImage.width = currentWidth/1.2; document.myImage.height = currentHeight/1.2; zoomLevel = zoomLevel - 1; update(); } function resetImage(){ document.myImage.width = originalWidth; document.myImage.height = originalHeight; zoomLevel = 0; update(); } function update(){ currentWidth = document.myImage.width; currentHeight = document.myImage.height; zoomsize.innerText = zoomLevel; imgsize.innerText = currentWidth + "X" + currentHeight; }
html的body中的代码如下:
<body οnlοad="initial()">
<div id="biankuang" data-orient="center">
<img name="myImage" src="/img/c.jpg" alt="pic"/> //引入本地图片
</div>
<p>
<input type="button" value="放大图片" οnclick="zoomIn()">
<input type="button" value="缩小图片" οnclick="zoomOut()">
<input type="button" value="重置图片" οnclick="resetImage()">
<span id="zoomsize"></span> <span id="imgsize"></span></p>
</body>