- function checkType(upload){
- var image = document.getElementById(upload).value;
- var extStart = image.lastIndexOf(".");
- var ext = image.substring(extStart, image.length).toUpperCase();
- if ( ext != ".PNG" && ext != ".GIF" && ext != ".JPG" && ext != ".JPEG") {
- alert("图片限于png,gif,jpeg,jpg格式!");
- return false;
- }
- return true;
- }
- function setImagePreview(upload,preview) {
- if(checkType(upload)){
- showTips('result','图片预览:',0);
- var docObj=document.getElementById(upload);
- var imgObjPreview=document.getElementById(preview);
- if(docObj.files && docObj.files[0]){
- //火狐下,直接设img属性
- imgObjPreview.style.display = 'block';
- imgObjPreview.style.width = '160px';
- imgObjPreview.style.height = '120px';
- try{
- imgObjPreview.src = docObj.files[0].getAsDataURL();
- }catch(e){
- //火狐7以上版本不能用上面的getAsDataURL()方式获取,需要一下方式
- imgObjPreview.src = window.URL.createObjectURL(docObj.files[0]);
- }
- }else{
- //IE下,使用滤镜
- docObj.select();
- var imgSrc = document.selection.createRange().text;
- var localImagId = document.getElementById("localImag");
- //必须设置初始大小
- localImagId.style.width = "160px";
- localImagId.style.height = "120px";
- //图片异常的捕捉,防止用户修改后缀来伪造图片
- try{
- localImagId.style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";
- localImagId.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc;
- }catch(e){
- alert("您上传的图片格式不正确,请重新选择!");
- return false;
- }
- imgObjPreview.style.display = 'none';
- document.selection.empty();
- }
- return true;
- }
- }
- //该片段来自于http://www.codesnippet.cn/detail/270320149138.html
来源: http://www.codesnippet.cn/detail/270320149138.html