图片上传即时显示缩略图的js代码_图象特效

<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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缩略图
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