zoukankan      html  css  js  c++  java
  • 图片上传预览

    最近项目中用到的图片上传前预览功能,兼容IE6-9,FF
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
            <body>
                    <input type=file name="doc" id="doc" onchange="javascript:setImagePreview();">
    <p>
    <div id="localImag"><img id="preview" width=-1 height=-1 style="diplay:none" /></div>
    </p>
    <script>
    function setImagePreview() {
            var docObj=document.getElementById("doc");
     
            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 = '300px';
                            imgObjPreview.style.height = '120px';                    
                            //imgObjPreview.src = docObj.files[0].getAsDataURL();
    
          //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 = "300px";
                            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;
            }
    </script>
    </body>
    </html>
  • 相关阅读:
    BP反向传播
    神经网络基本概念理解
    梯度下降算法理解(梯度的含义)
    ResNet
    残差是什么?拟合是什么?
    Perceptual Losses for Real-Time Style Transfer and Super-Resolution 论文理解
    java动手动脑之多态
    java 动手动脑之父子继承
    java动手动脑
    java验证课上代码
  • 原文地址:https://www.cnblogs.com/zywf/p/4852171.html
Copyright © 2011-2022 走看看