(客户端模拟裁剪图片）
imgareaselect:
http://odyniec.net/projects/imgareaselect/
php生成缩略图参考：
http://www.php.net/manual/en/book.image.php
http://www.webmotionuk.co.uk/php-jquery-image-upload-and-crop/
http://www.leonkessler.com/blog/?p=132
转载于:https://www.cnblogs.com/fightLonely/archive/2011/07/12/2104489.html
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