Posted in Javascript onNovember 11, 2013
以左上角为定点,放大缩小,该点位置不变。
方法一:
Html代码
<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) { oImgoImg.width = oImg.width * 1.1; oImgoImg.height = oImg.height * 1.1; } else { oImgoImg.width = oImg.width / 1.1; oImgoImg.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" onclick="ImageSuofang(true)" /> <input id="btn2" type="button" value="缩小" onclick="ImageSuofang(false)" /> <!-- <input type="button" value="<-Rotate逆时针" name="RotateL" id="RotateL" onclick="rotateRight('oImg',90);"> --> </form>
方法二:
CSS编码如下:
Css代码
#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:
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:
Html代码
<body onload="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" onclick="zoomIn()"> <input type="button" value="缩小图片" onclick="zoomOut()"> <input type="button" value="重置图片" onclick="resetImage()"> <span id="zoomsize"></span> <span id="imgsize"></span></p> </body>
JS简单的图片放大缩小的两种方法
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