图片base64转base30

Question

我想在数据库中保存签名，但图像 base64 字符串很长（大约 15 000 个字符）有没有将 base64 转换为 base30 的简单解决方案？

这是我的示例，我尝试添加 signaturePad.toDataURL("image/jSignature;base30"); 但无法正常工作。

    var wrapper = document.getElementById("signature-pad"),
    clearButton = wrapper.querySelector("[data-action=clear]"),
    saveButton = wrapper.querySelector("[data-action=save]"),
    canvas = wrapper.querySelector("canvas"),
    signaturePad;

function resizeCanvas() {
    var ratio =  Math.max(window.devicePixelRatio || 1, 1);
    canvas.width = canvas.offsetWidth * ratio;
    canvas.height = canvas.offsetHeight * ratio;
    canvas.getContext("2d").scale(ratio, ratio);
}

window.onresize = resizeCanvas;
resizeCanvas();
alert(canvas);
signaturePad = new SignaturePad(canvas);

//Here get base64 string

saveButton.addEventListener("click", function (event) {

        document.getElementById("signatureDiv").value = signaturePad.toDataURL();
        saveToDB(signaturePad.toDataURL);
    }
});

Answer 1

你想做的是不合格

查看此 link on line toDataURL() method of <\canvas> that mean that the toDataUrlis the canvas method and the first param of the toDataUrl get in witch format to convert to base64 位图。

图片base64转base30

Convert image base64 to base30

html

javascript

base64

signature