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//相机 //相册 

 var MAX_WH=800; var image=new Image(); image.onload=function () { if(image.height > MAX_WH) { // 宽度等比例缩放 *= image.width *= MAX_WH/ image.height; image.height = MAX_WH; } if(image.width > MAX_WH) { // 宽度等比例缩放 *= image.height *= MAX_WH/ image.width; image.width = MAX_WH; } } image.src=dataURL;//dataURL通过FileReader获取 

 var quality=80; var cvs = document.createElement('canvas'); cvs.width = image.width; cvs.heigh = image.height; var context=cvs.getContext("2d"); context.drawImage(image, 0, 0,image.width, image.height); dataURL = cvs.toDataURL('image/jpeg', quality/100); 

 //file通过input标签获取 EXIF.getData(file,function(){ orientation=EXIF.getTag(file,'Orientation'); });

 switch (orientation) { case 6: case 8: cvs.width = height; cvs.height = width; break; } var context=cvs.getContext("2d"); switch(orientation){ //iphone横屏拍摄，此时home键在左侧 case 3: // 180度向左旋转 context.translate(width, height); context.rotate(Math.PI); break; //iphone竖屏拍摄，此时home键在下方(正常拿手机的方向) case 6: context.rotate(0.5 * Math.PI); context.translate(0, -height); break; //iphone竖屏拍摄，此时home键在上方 case 8: // 逆时针旋转90度 context.rotate(-0.5 * Math.PI); context.translate(-width, 0); break; } 

 $('input[type=file]').change(function(e) { var file = this.files[0]; var mime_type=file.type; var orientation=0; if (file && /^image\//i.test(file.type)) { EXIF.getData(file,function(){ orientation=EXIF.getTag(file,'Orientation'); }); var reader = new FileReader(); reader.onloadend = function () { var width,height; var MAX_WH=800; var image=new Image(); image.onload=function () { if(image.height > MAX_WH) { // 宽度等比例缩放 *= image.width *= MAX_WH / image.height; image.height = MAX_WH; } if(image.width > MAX_WH) { // 宽度等比例缩放 *= image.height *= MAX_WH / image.width; image.width = MAX_WH; } //压缩 var quality=80; var cvs = document.createElement('canvas'); cvs.width = width = image.width; cvs.height =height = image.height; switch (orientation) { case 6: case 8: cvs.width = height; cvs.height = width; break; } var context=cvs.getContext("2d"); //解决ios图片旋转问题 switch(orientation){ //iphone横屏拍摄，此时home键在左侧 case 3: // 180度向左旋转 context.translate(width, height); context.rotate(Math.PI); break; //iphone竖屏拍摄，此时home键在下方(正常拿手机的方向) case 6: context.rotate(0.5 * Math.PI); context.translate(0, -height); break; //iphone竖屏拍摄，此时home键在上方 case 8: // 逆时针旋转90度 context.rotate(-0.5 * Math.PI); context.translate(-width, 0); break; } context.drawImage(image, 0, 0,image.width, image.height); dataURL = cvs.toDataURL('image/jpeg', quality/100); //获取识别结果 ... } image.src=dataURL; }; reader.readAsDataURL(file); }else{ alert("只能识别图片！") } });