jQuery用户头像裁剪插件cropbox.js如何使用

几乎每一个网页是必备图片上传，图片裁剪功能，这里通过cropbox.js插件实现该功能。

<script src=http://www.shancun.net/skin/default/image/nopic.gif src=http://www.shancun.net/skin/default/image/nopic.gif type=http://www.shancun.net/skin/default/image/nopic.giftext/javascripthttp://www.shancun.net/skin/default/image/nopic.gif>  $(window).load(function() {    var options =    {      thumbBox: '.thumbBox',      spinner: '.spinner',      imgSrc: 'images/avatar.png'    }    var cropper = $('.imageBox').cropbox(options);    $('#file').on('change', function(){      var reader = new FileReader();      reader.onload = function(e) {        options.imgSrc = e.target.result;        cropper = $('.imageBox').cropbox(options);      }      reader.readAsDataURL(this.files[0]);      this.files = [];    })    $('#btnCrop').on('click', function(){      var img = cropper.getDataURL();      $('.cropped').append('<img src=http://www.shancun.net/skin/default/image/nopic.gif'+img+'http://www.shancun.net/skin/default/image/nopic.gif>');    })    $('#btnZoomIn').on('click', function(){      cropper.zoomIn();    })    $('#btnZoomOut').on('click', function(){      cropper.zoomOut();    })  });</script>