JS实现获取图片大小和预览的方法完整实例【兼容IE和其它浏览器】

2019-11-19 16:45:02

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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：