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  function downloadURI(uri, name) {
       var link = document.createElement('a');
       link.download = name;
       link.href = uri;
       document.body.appendChild(link);
       link.click();
       document.body.removeChild(link);
       delete link;
     }

     document.getElementById('save').addEventListener(
       'click',
       function () {
         var dataURL = stage.toDataURL({ pixelRatio: 3 });
         downloadURI(dataURL, 'stage.png');
       },
       false
     );

这是为html5实现的,但我想知道如何在反应中实现它请帮助我已经坚持了好几天

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