他我这里有一个脚本，用户可以在其中选择一个文件，但是当他们完成选择一个文件后，我怎样才能使脚本将图片发送到一个 php 脚本，以便我可以上传到服务器上？
$(function() {
/*
In this code, we are going to do the following:
1. Accept an image on drag and drop
2. Create a new canvas element (original), with a max size
of 500x500px (customizable) and keep it in memory
3. Listen for clicks on the filters. When one is selected:
3.1 Create a clone of the original canvas
3.2 Remove any canvas elements currently on the page
3.3 Append the clone to the #photo div
3.4 If the selected filter is different from the "Normal"
one, call the Caman library. Otherwise do nothing.
3.5 Mark the selected filter with the "active" class
4. Trigger the "Normal" filter
*/
var maxWidth = 500,
maxHeight = 500,
photo = $('#photo'),
originalCanvas = null,
filters = $('#filters li a'),
filterContainer = $('#filterContainer');
// Use the fileReader plugin to listen for
// file drag and drop on the photo div:
photo.fileReaderJS({
on:{
load: function(e, file){
// An image has been dropped.
var img = $('<img>').appendTo(photo),
imgWidth, newWidth,
imgHeight, newHeight,
ratio;
// Remove canvas elements left on the page
// from previous image drag/drops.
photo.find('canvas').remove();
filters.removeClass('active');
// When the image is loaded successfully,
// we can find out its width/height:
img.load(function() {
imgWidth = this.width;
imgHeight = this.height;
// Calculate the new image dimensions, so they fit
// inside the maxWidth x maxHeight bounding box
if (imgWidth >= maxWidth || imgHeight >= maxHeight) {
// The image is too large,
// resize it to fit a 500x500 square!
if (imgWidth > imgHeight) {
// Wide
ratio = imgWidth / maxWidth;
newWidth = maxWidth;
newHeight = imgHeight / ratio;
} else {
// Tall or square
ratio = imgHeight / maxHeight;
newHeight = maxHeight;
newWidth = imgWidth / ratio;
}
} else {
newHeight = imgHeight;
newWidth = imgWidth;
}
// Create the original canvas.
originalCanvas = $('<canvas>');
var originalContext = originalCanvas[0].getContext('2d');
// Set the attributes for centering the canvas
originalCanvas.attr({
width: newWidth,
height: newHeight
}).css({
marginTop: -newHeight/2,
marginLeft: -newWidth/2
});
// Draw the dropped image to the canvas
// with the new dimensions
originalContext.drawImage(this, 0, 0, newWidth, newHeight);
// We don't need this any more
img.remove();
filterContainer.fadeIn();
// Trigger the default "normal" filter
filters.first().click();
});
// Set the src of the img, which will
// trigger the load event when done:
img.attr('src', e.target.result);
},
beforestart: function(file){
// Accept only images.
// Returning false will reject the file.
return /^image/.test(file.type);
}
}
});
// Listen for clicks on the filters
filters.click(function(e){
e.preventDefault();
var f = $(this);
if(f.is('.active')){
// Apply filters only once
return false;
}
filters.removeClass('active');
f.addClass('active');
// Clone the canvas
var clone = originalCanvas.clone();
// Clone the image stored in the canvas as well
clone[0].getContext('2d').drawImage(originalCanvas[0],0,0);
// Add the clone to the page and trigger
// the Caman library on it
photo.find('canvas').remove().end().append(clone);
var effect = $.trim(f[0].id);
Caman(clone[0], function () {
// If such an effect exists, use it:
if( effect in this){
this[effect]();
this.render();
// Show the download button
showDownload(clone[0]);
}
else{
hideDownload();
}
});
});
// Use the mousewheel plugin to scroll
// scroll the div more intuitively
filterContainer.find('ul').on('mousewheel',function(e, delta){
this.scrollLeft -= (delta * 50);
e.preventDefault();
});
var downloadImage = $('a.downloadImage');
function showDownload(canvas){
downloadImage.off('click').click(function(){
// When the download link is clicked, get the
// DataURL of the image and set it as href:
var url = canvas.toDataURL("image/png;base64;");
downloadImage.attr('href', url);
}).fadeIn();
}
function hideDownload(){
downloadImage.fadeOut();
}
});