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tool-box
/
base64.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>网络状态</title>
    <script src="./js/utils.js"></script>
    <style type='text/css'>
        * {
            margin: 0;
            padding: 0;
            text-align: center;
        }
        .home {
            text-align: center;
        }
        img {
            width: 80px;
            height: 50px;
        }
    </style>
</head>
<body>
    <img id="img" src=''/>
    <script>
        let url = 'https://positivethinking.tech/wp-content/uploads/2021/01/Vue.js-as-en-enterprise-solution-France-Belgium-Luxembourg-germany-800x533.jpg';
        let base64 = localStorage.getItem('BASE54IMGE');
        if (base64) {
            document.getElementById('img').src= base64;
        } else {
            document.getElementById('img').src= url;
            var canvas = document.createElement('CANVAS'),
                ctx = canvas.getContext('2d'),
                imgObj = new Image;
            imgObj.crossOrigin = 'Anonymous';
            imgObj.onload = function(){
                canvas.height = imgObj.height;
                canvas.width = imgObj.width;
                ctx.drawImage(imgObj,0,0);
                var dataURL = canvas.toDataURL('image/png');
                localStorage.setItem('BASE54IMGE', dataURL);
                canvas = null;
            };
            imgObj.src = url;
        }
    </script>


</body>
</html>