js 플러그인 작성 (그림 업로드)

 },
 onDragover:function (e) {
     e.stopPropagation();
     e.preventDefault();
     e.dataTransfer.dropEffect = 'copy';
 },
 onDrop:function (e) {
     var self = this;
     e.stopPropagation();
     e.preventDefault();
     var fileList = e.dataTransfer.files; //      
     // do something upload
     if(fileList.length == 0){
         return false;
     }
     //         
     if(fileList[0].type.indexOf('image') === -1){
         alert("       ！");
         return false;
     }

     //        ，        
     var img = window.URL.createObjectURL(fileList[0]);
     var filename = fileList[0].name; //    
     var filesize = Math.floor((fileList[0].size)/1024);
     if(filesize>500){
         alert("        500K.");
         return false;
     }

     self.me.find("img").attr("src",img);
     self.me.find("img").attr("title",filename);
     if(this.callback){
         this.callback(fileList);
     }
 },
 eventClickInit:function () {
     var self = this;
     this.me.unbind().click(function () {
         self.createImageUploadDialog();
     })
     var dp = this.me[0];
     dp.addEventListener('dragover', function(e) {
         self.onDragover(e);
     });
     dp.addEventListener("drop", function(e) {
         self.onDrop(e);
     });


 },
 onChangeUploadFile:function () {
     var fileInput = this.fileInput;
     var files = fileInput.files;
     var file = files[0];
     var img = window.URL.createObjectURL(file);
     var filename = file.name;
     this.me.find("img").attr("src",img);
     this.me.find("img").attr("title",filename);
     if(this.callback){
         this.callback(files);
     }
 },
 createImageUploadDialog:function () {
     var fileInput = this.fileInput;
     if (!fileInput) {
         //    input  
         fileInput = document.createElement('input');
         //  input type     
         fileInput.type = 'file';
         //    name
         fileInput.name = 'ime-images';
         //        
         fileInput.multiple = true;
         fileInput.onchange  = this.onChangeUploadFile.bind(this);
         this.fileInput = fileInput;
     }
     //    input    ，         
     fileInput.click();
 }