本文实例讲述了JS实现获取图片大小和预览的方法。分享给大家供大家参考，具体如下：<
本文实例讲述了JS实现获取图片大小和预览的方法。分享给大家供大家参考，具体如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>JS获取图片大小和预览【兼容IE和其它浏览器】</title>
</head>
<script type="application/javascript">
function previewImage(oImage,preViewId){
if(!oImage.value.match(/.jpg|.jpeg|.gif|.png|.bmp/i)){
//alert('图片格式无效！');
return;
}
var imgPath = "";
if(document.all){
//低版本IE浏览器
oImage.select();
imgPath = document.selection.createRange().text;
//使用滤镜效果
var tempValue = "progid:DXImageTransform.Microsoft.AlphaImageLoader("
tempValue += "enabled='true',sizingMethod='scale',src=\"" + imgPath + "\")";
document.getElementById(preViewId).style.filter = tempValue;
}else{
//非IE浏览器，如火狐google等浏览器
imgPath = window.URL.createObjectURL(oImage.files[0]); //FF7.0以上
document.getElementById(preViewId).src = imgPath; //显示预览图
}
};
function getFileSize(objFile){
var fileSize = objFile.fileSize || 0;
if(fileSize == 0) {
fileSize = objFile.files[0].size;
}
return fileSize;
}
function imageChange(){
var oImg = document.getElementById("imageFile01");
previewImage(oImg,"preview");
var fileSize = getFileSize(oImg);
fileSize = Math.ceil(fileSize / 1024) + "KB";
var filePath =oImg.value;
var agent = window.navigator.userAgent;
var tempValue = "<br>File size: " + fileSize;
tempValue += "<br>File path: " + filePath;
tempValue += "<br>agent=" + agent;
document.getElementById("imageInfo").innerHTML = tempValue;
};
</script>
<body>
<h3>JS获取图片大小和预览【兼容IE和其它浏览器】</h3>
<img id="preview" style="width: 100px; height: 60px; border: 0px;" />
<br>
<input name="imageFile01" id="imageFile01" type="file" onchange="javascript:imageChange();" />
<br>
<div id="imageInfo"></div>
</body>
</html>运行效果图如下：
