用javaScript获取文件,jpg图片大小
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- <HTML>
- <HEAD>
- <SCRIPT>
- function getImageDimension (imgURL, loadHandler) {
- var img = new Image();
- img.onload = loadHandler;
- if (document.layers
- && location.protocol.toLowerCase() != 'file:'
- && navigator.javaEnabled())
- netscape.security.PrivilegeManager.enablePrivilege(
- 'UniversalFileRead'
- );
- img.src = imgURL;
- }
- function getFileSize (fileName) {
- if (document.layers) {
- if (navigator.javaEnabled()) {
- var file = new java.io.File(fileName);
- if (location.protocol.toLowerCase() != 'file:')
- netscape.security.PrivilegeManager.enablePrivilege(
- 'UniversalFileRead'
- );
- return file.length();
- }
- else return -1;
- }
- else if (document.all) {
- window.oldOnError = window.onerror;
- window.onerror = function (err) {
- if (err.indexOf('utomation') != -1) {
- alert('file access not possible');
- return true;
- }
- else
- return false;
- };
- var fso = new ActiveXObject('Scripting.FileSystemObject');
- var file = fso.GetFile(fileName);
- window.onerror = window.oldOnError;
- return file.Size;
- }
- }
- function showImageDimensions () {
- alert(this.width + 'x' + this.height);
- }
- </SCRIPT>
- <SCRIPT>
- function checkImageDimensions (fileName) {
- var imgURL = 'file:///' + fileName;
- getImageDimension(imgURL, showImageDimensions);
- }
- </SCRIPT>
- </HEAD>
- <BODY>
- <FORM NAME="formName">
- <INPUT TYPE="file" NAME="fileName">
- <BR>
- <INPUT TYPE="button" VALUE="check file size"
- ONCLICK="alert(getFileSize(this.form.fileName.value))"
- >
- <BR>
- <INPUT TYPE="button" VALUE="check image dimensions"
- ONCLICK="checkImageDimensions(this.form.fileName.value)"
- >
- </FORM>
- </BODY>
- </HTML>