js实现图片上传并正常显示

<label for="thumbnail" class="col-md-3 control-label">缩略图</label><div class="col-md-6"> <input type="file" class="form-control" id="thumbnail" name="thumbnail"></div>

function getObjectURL(file) { var url = null ; if (window.createObjectURL!=undefined) { // basic url = window.createObjectURL(file) ; } else if (window.URL!=undefined) { // mozilla(firefox) url = window.URL.createObjectURL(file) ; } else if (window.webkitURL!=undefined) { // webkit or chrome url = window.webkitURL.createObjectURL(file) ; } return url ;}$('#thumbnail').change(function() { var eImg = $('<img />'); eImg.attr('src', getObjectURL($(this)[0].files[0])); // 或 this.files[0] this->input $(this).after(eImg);});

<form action='' method='post' name='myform'> <input type='file' id='iptfileupload' onchange='show()' value='' /> <img src='1.jpg' alt='' id='img' /></form>

<script type="text/javascript"> function getPath(obj,fileQuery,transImg) {  var imgSrc = '', imgArr = [], strSrc = '' ;  if(window.navigator.userAgent.indexOf("MSIE")>=1){ // IE浏览器判断  if(obj.select){   obj.select();   var path=document.selection.createRange().text;   alert(path) ;   obj.removeAttribute("src");   imgSrc = fileQuery.value ;   imgArr = imgSrc.split('.') ;   strSrc = imgArr[imgArr.length - 1].toLowerCase() ;   if(strSrc.localeCompare('jpg') === 0 || strSrc.localeCompare('jpeg') === 0 || strSrc.localeCompare('gif') === 0 || strSrc.localeCompare('png') === 0){   obj.setAttribute("src",transImg);   obj.style.filter=    "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+path+"', sizingMethod='scale');"; // IE通过滤镜的方式实现图片显示   }else{   //try{   throw new Error('File type Error! please image file upload..');    //}catch(e){   // alert('name: ' + e.name + 'message: ' + e.message) ;   //}   }  }else{   // alert(fileQuery.value) ;   imgSrc = fileQuery.value ;   imgArr = imgSrc.split('.') ;   strSrc = imgArr[imgArr.length - 1].toLowerCase() ;   if(strSrc.localeCompare('jpg') === 0 || strSrc.localeCompare('jpeg') === 0 || strSrc.localeCompare('gif') === 0 || strSrc.localeCompare('png') === 0){   obj.src = fileQuery.value ;   }else{   //try{   throw new Error('File type Error! please image file upload..') ;   //}catch(e){   // alert('name: ' + e.name + 'message: ' + e.message) ;   //}   }  }  } else{  var file =fileQuery.files[0];  var reader = new FileReader();  reader.onload = function(e){   imgSrc = fileQuery.value ;   imgArr = imgSrc.split('.') ;   strSrc = imgArr[imgArr.length - 1].toLowerCase() ;   if(strSrc.localeCompare('jpg') === 0 || strSrc.localeCompare('jpeg') === 0 || strSrc.localeCompare('gif') === 0 || strSrc.localeCompare('png') === 0){   obj.setAttribute("src", e.target.result) ;   }else{   //try{   throw new Error('File type Error! please image file upload..') ;   //}catch(e){   // alert('name: ' + e.name + 'message: ' + e.message) ;   //}   }   // alert(e.target.result);   }  reader.readAsDataURL(file);  } } function show(){  //以下即为完整客户端路径  var file_img=document.getElementById("img"),  iptfileupload = document.getElementById('iptfileupload') ;  getPath(file_img,iptfileupload,file_img) ; } </script>