jQuery实现图片上传和裁剪插件Croppie

<script src="jquery.min.js"></script> 
<script src="croppie.min.js"></script> 
<link rel="stylesheet" href="croppie.css"> 

<div class="actions"> 
 <button class="file-btn"> 
  <span>上传</span> 
  <input type="file" id="upload" value="选择图片文件" /> 
 </button> 
 <div class="crop"> 
  <div id="upload-demo"></div> 
  <button class="upload-result">裁剪</button> 
 </div> 
 <div id="result"></div> 
</div> 

button, 
a.btn { 
 background-color: #189094; 
 color: white; 
 padding: 10px 15px; 
 border-radius: 3px; 
 border: 1px solid rgba(255, 255, 255, 0.5); 
 font-size: 16px; 
 cursor: pointer; 
 text-decoration: none; 
 text-shadow: none; 
} 
button:focus { 
 outline: 0; 
} 
 
.file-btn { 
 position: relative; 
} 
.file-btn input[type="file"] { 
 position: absolute; 
 top: 0; 
 left: 0; 
 width: 100%; 
 height: 100%; 
 opacity: 0; 
} 
 
.actions { 
 padding: 5px 0; 
} 
.actions button { 
 margin-right: 5px; 
} 
.crop{display:none} 

$(function(){ 
 var $uploadCrop; 
 
  function readFile(input) { 
    if (input.files && input.files[0]) { 
    var reader = new FileReader(); 
     
    reader.onload = function (e) { 
     $uploadCrop.croppie('bind', { 
      url: e.target.result 
     }); 
    } 
     
    reader.readAsDataURL(input.files[0]); 
   } 
   else { 
    alert("Sorry - you're browser doesn't support the FileReader API"); 
   } 
  } 
 
  $uploadCrop = $('#upload-demo').croppie({ 
   viewport: { 
    width: 200, 
    height: 200, 
    type: 'circle' 
   }, 
   boundary: { 
    width: 300, 
    height: 300 
   } 
  }); 
 
  $('#upload').on('change', function () { 
   $(".crop").show(); 
   readFile(this); 
  }); 
  $('.upload-result').on('click', function (ev) { 
   $uploadCrop.croppie('result', 'canvas').then(function (resp) { 
    popupResult({ 
     src: resp 
    }); 
   }); 
  }); 
   
 function popupResult(result) { 
  var html; 
  if (result.html) { 
   html = result.html; 
  } 
  if (result.src) { 
   html = '<img src="' + result.src + '" />'; 
  } 
  $("#result").html(html); 
 } 
});