<script language="javascript" type="text/javascript"> var allowExt = ['jpg', 'gif', 'bmp', 'png', 'jpeg']; var preivew = function(file, container){ try{ var pic = new Picture(file, container); }catch(e){ alert(e); } } //缩略图类定义 var Picture = function(file, container){ var height = 0, widht = 0, ext = '', size = 0, name = '', path = ''; var self = this; if(file){ name = file.value; if (window.navigator.userAgent.indexOf("MSIE")>=1){ file.select(); path = document.selection.createRange().text; }else if(window.navigator.userAgent.indexOf("Firefox")>=1){ if(file.files){ path = file.files.item(0).getAsDataURL(); }else{ path = file.value; } } }else{ throw "bad file"; } ext = name.substr(name.lastIndexOf("."), name.length); if(container.tagName.toLowerCase() != 'img'){ throw "container is not a valid img label"; container.visibility = 'hidden'; } container.src = path; container.alt = name; container.style.visibility = 'visible'; height = container.height; widht = container.widht; size = container.fileSize; this.get = function(name){ return self[name]; } this.isValid = function(){ if(allowExt.indexOf(self.ext) !== -1){ throw 'the ext is not allowed to upload'; return false; } } }</script> <div class='previewDemo'> <input id="file" type="file" onchange="preivew(this, document.getElementById('img'));"> <img id="img" style="visibility:hidden" height="100px" width="100px"></div>

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本文标题：图片上传即时显示缩略图的js代码

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