var binary_str = atob(base64_img); //轉為原始編碼
var array = new Uint8Array(new ArrayBuffer(binary_str.length
 
));
for ( var i = 0;  i < binary_str.length; i++) {
    array[i] = bb.charCodeAt(i);
}
var dv = new DataView(array.buffer);
var blob_img = new Blob([dv], {'type': 'image/png'});
//獲取了blob型別的圖片資料之後就好辦了
var form = new FormData();
form.append('img_name', blob_img);
var xhr=new XMLHttpRequest();
xhr.open
 
('POST', your_img_server);
xhr.onload = function (e) {
    //your code
};

xhr.send(form);

progress_f = function ( event ) {
    if (event.lengthComputable) {
    var percentComplete = event.loaded / event.total * 100;
    var klass = arguments.callee.klass; //這個重點
    var progress_tag = $('.' + klass );
    progress_tag.innerHTML = '正在上傳....'+ percentComplete + '%'
    }
}
progress_f.klass = '123';   //傳遞 k,v 為 klass, 123的引數

/**
 * 複製貼上圖片，chrome
 * @param  {event} e 
 */
$(your-editor-selector).bind('paste', function(e){
    var clip =  e.originalEvent.clipboardData || e.clipboardData;
    if ( !/image/.test(clip.types[0])) { //只處理圖片
        return true;
    }
    var items = clip.items;
    if ( items ) {
        var img_blob = items[0].getAsFile(); //獲取圖片的blob資料
        var rd = new FileReader();
        rd.onload = function ( e ) {
            var base64_img = rd.result;
            document.execCommand("insertHTML",false,'<img src="' + base64_img + '">');
        }
        rd.readAsDataURL(img_blob);

        e.preventDefault();
    }


});