JS實(shí)現(xiàn)獲取圖片大小和預(yù)覽的方法完整實(shí)例【兼容IE和其它瀏覽器】

2019-11-19 16:45:02

字體：大中小

供稿：網(wǎng)友

本文實(shí)例講述了JS實(shí)現(xiàn)獲取圖片大小和預(yù)覽的方法。分享給大家供大家參考，具體如下：

<!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獲取圖片大小和預(yù)覽【兼容IE和其它瀏覽器】</title></head><script type="application/javascript">function previewImage(oImage,preViewId){  if(!oImage.value.match(/.jpg|.jpeg|.gif|.png|.bmp/i)){    //alert('圖片格式無(wú)效！');    return;  }  var imgPath = "";  if(document.all){    //低版本IE瀏覽器    oImage.select();    imgPath = document.selection.createRange().text;    //使用濾鏡效果    var tempValue = "progid:DXImageTransform.Microsoft.AlphaImageLoader("    tempValue += "enabled='true',sizingMethod='scale',src=/"" + imgPath + "/")";    document.getElementById(preViewId).style.filter = tempValue;  }else{    //非IE瀏覽器，如火狐google等瀏覽器    imgPath = window.URL.createObjectURL(oImage.files[0]); //FF7.0以上    document.getElementById(preViewId).src = imgPath; //顯示預(yù)覽圖  }};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獲取圖片大小和預(yù)覽【兼容IE和其它瀏覽器】</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>

運(yùn)行效果圖如下：