snapshot

<h1>点击下面按钮查看不同截图效果</h1>

<a href="javascript:void(0)" class="btn screen">截取屏幕并保存到相册</a>
<a href="javascript:void(0)" class="btn viewport">viewport截图返回fileURL</a>

<script>
function ready(callback) {
  // 如果jsbridge已经注入则直接调用
  if (window.AlipayJSBridge) {
    callback && callback();
  } else {
    // 如果没有注入则监听注入的事件
    document.addEventListener('AlipayJSBridgeReady', callback, false);
  }
}
ready(function() {
  document.querySelector('.screen').addEventListener('click', function() {
    AlipayJSBridge.call('snapshot', function(result) {
      alert(JSON.stringify(result));
    });
  });

  document.querySelector('.viewport').addEventListener('click', function() {
    AlipayJSBridge.call('snapshot', {
      range: 'viewport',
      dataType: 'fileURL',
      saveToGallery: false
    }, function(result) {
      alert(JSON.stringify(result));
    });
  });
});
</script>