require([ 'img_upload', '../puzzle/canvasImg', '../puzzle/canvasElement' ], function(
S, canvasImg, canvasElement) {
var img=[];
var canvas = new canvasElement.Element();
canvas.init('canvid1', {
width : 600,
height : 450
});
S('.puzzle_column img').on('click',function(e){
var index=this.getAttribute('data-index');
$('bg').onload = function() {
var ctx=$('canvid1-canvas-background').getContext('2d');
ctx.clearRect(0, 0,600,450);
img[0]=new canvasImg.Img($('bg'), {});
canvas.setCanvasBackground(img[0]);
};
$('bg').setAttribute('src','medium_img/'+index+'.jpg');
e.stopPropagation();
});
var CanvasDemo = function() {
return {
init : function() {
var img_list=dom.query('#puzzle_canvas img');
img[0]=new canvasImg.Img($('bg'), {});
S.each(img_list,function(i,el){
el.setAttribute('data-index',i);
img.push(new canvasImg.Img(el, {}));
canvas.addImage(img[i+1]);
});
canvas.setCanvasBackground(img[0]);
this.cornersvisible = (this.cornersvisible) ? false : true;
this.modifyImages(function(image) {
image.setCornersVisibility(this.cornersvisible);
});
},
modifyImages : function(fn) {
for ( var i =0, l = canvas._aImages.length; i < l; i += 1) {
fn.call(this, canvas._aImages[i]);
}
canvas.renderAll(false,false);
S('#puzzle_canvas img').remove();
img = [];
}
};
}();
function getCurImg(){
var oImg=canvas._prevTransform.target;
for(var i=0;i<canvas._aImages.length;i++){
if(canvas._aImages[i]._oElement.src==oImg._oElement.src){
return i;
}
}
}
S('#photo_delete').on('click',function(e){
var i=getCurImg();
canvas._aImages.splice(i,1);
canvas.renderAll(true,true);
$('canvas_menu').style.display="none";
});
S('#photo_update').on('click',function(e){
$('test').click();
});
S('#test').on('change',function(e){
var files = e.target.files || e.dataTransfer.files;
var reader = new FileReader();
reader.onload = (function() {
return function(e) {
var dataURL = e.target.result, canvas1 = document.querySelector('#test_canvas'), ctx = canvas1.getContext('2d'), img = new Image();
img.onload = function(e) {
if(img.width>200||img.height>200){
var prop=Math.min(200/img.width,200/img.height);
img.width=img.width*prop;
img.height=img.height*prop;
}
canvas1.width=img.width;
canvas1.height=img.height;
ctx.drawImage(img, 0, 0, img.width, img.height);
S('#canvid1').html(S('#canvid1').html()+"<img src='"+canvas1.toDataURL("image/jpeg")+"'/>");
var t = window.setTimeout(function() {
var i=getCurImg(),target=canvas._prevTransform.target;
console.log(target);
canvas._aImages[i]=new canvasImg.Img(dom.query('#canvid1 img')[0], {
top:target.top,
left:target.left,
scalex:target.scalex,
scaley:target.scaley,
angle:canvas.curAngle
});
canvas.renderTop();
clearTimeout(t);
S('#canvid1 img').remove();
},1000);
};
img.src = dataURL;
};
})();
reader.readAsDataURL(files[0]);
});
S('#upload_btn').on('click',function(){
var imgData = canvas.canvasTo('jpeg');
var imgValue = imgData.substr(22);
S.ajax({
url : 'http://localhost/html5/upload1.php',
type : 'POST',
data : {
imgData : imgValue,
file_name :'mix_img.jpeg'
},
dataType : 'text',
success : function(data) {
alert("s");
}
});
});
});

至于用html5 input读取图片，这很简单就不贴出来了。

希望本文所述对大家的HTML5程序设计有所帮助。