js本地图片预览

 1 <div id="divPreview">

 2      <img id="imgHeadPhoto" src="Images/Headphoto/noperson.jpg" style="width: 160px; height: 170px;border: solid 1px #d2e2e2;" alt="" />

 3 </div>

 4 <input type="file" id="fuHeadPhoto" onchange="PreviewImage(this,'imgHeadPhoto','divPreview')">

 5 <script type="text/javascript">

 6 //js本地图片预览，兼容ie[6-9]、火狐、Chrome17+、Opera11+、Maxthon3、360浏览器

 7 function PreviewImage(fileObj,imgPreviewId,divPreviewId){

 8     var allowExtention=".jpg,.bmp,.gif,.png";//允许上传文件的后缀名document.getElementById("hfAllowPicSuffix").value;

 9     var extention=fileObj.value.substring(fileObj.value.lastIndexOf(".")+1).toLowerCase();            

10     var browserVersion= window.navigator.userAgent.toUpperCase();

11     if(allowExtention.indexOf(extention)>-1){ 

12         if(fileObj.files){//兼容chrome、火狐7+、360浏览器5.5+等，应该也兼容ie10，HTML5实现预览

13             if(window.FileReader){

14                 var reader = new FileReader(); 

15                 reader.onload = function(e){

16                     document.getElementById(imgPreviewId).setAttribute("src",e.target.result);

17                 }  

18                 reader.readAsDataURL(fileObj.files[0]);

19             }else if(browserVersion.indexOf("SAFARI")>-1){

20                 alert("不支持Safari浏览器6.0以下版本的图片预览!");

21             }

22         }else if (browserVersion.indexOf("MSIE")>-1){//ie、360低版本预览

23             if(browserVersion.indexOf("MSIE 6")>-1){//ie6

24                 document.getElementById(imgPreviewId).setAttribute("src",fileObj.value);

25             }else{//ie[7-9]

26                 fileObj.select();

27                 if(browserVersion.indexOf("MSIE 9")>-1)

28                     fileObj.blur();//不加上document.selection.createRange().text在ie9会拒绝访问

29                 var newPreview =document.getElementById(divPreviewId+"New");

30                 if(newPreview==null){

31                     newPreview =document.createElement("div");

32                     newPreview.setAttribute("id",divPreviewId+"New");

33                     newPreview.style.width = document.getElementById(imgPreviewId).width+"px";

34                     newPreview.style.height = document.getElementById(imgPreviewId).height+"px";

35                     newPreview.style.border="solid 1px #d2e2e2";

36                 }

37                 newPreview.style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod='scale',src='" + document.selection.createRange().text + "')";                            

38                 var tempDivPreview=document.getElementById(divPreviewId);

39                 tempDivPreview.parentNode.insertBefore(newPreview,tempDivPreview);

40                 tempDivPreview.style.display="none";                    

41             }

42         }else if(browserVersion.indexOf("FIREFOX")>-1){//firefox

43             var firefoxVersion= parseFloat(browserVersion.toLowerCase().match(/firefox\/([\d.]+)/)[1]);

44             if(firefoxVersion<7){//firefox7以下版本

45                 document.getElementById(imgPreviewId).setAttribute("src",fileObj.files[0].getAsDataURL());

46             }else{//firefox7.0+                    

47                 document.getElementById(imgPreviewId).setAttribute("src",window.URL.createObjectURL(fileObj.files[0]));

48             }

49         }else{

50             document.getElementById(imgPreviewId).setAttribute("src",fileObj.value);

51         }         

52     }else{

53         alert("仅支持"+allowExtention+"为后缀名的文件!");

54         fileObj.value="";//清空选中文件

55         if(browserVersion.indexOf("MSIE")>-1){                        

56             fileObj.select();

57             document.selection.clear();

58         }                

59         fileObj.outerHTML=fileObj.outerHTML;

60     }

61 }

62 </script>