[blob和base64互相转换]#浏览器全局对象 #数据转换

blobToBase64.js

//blob转base64
function blobToDataURI(blob, callback) {
    let reader = new FileReader();
    reader.onload = function(e) {
        callback(e.target.result);
    }
    reader.readAsDataURL(blob);
}
//base64转blob
function dataURItoBlob(dataURI) {
    let mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0]; // mime类型
    let byteString = atob(dataURI.split(',')[1]); //base64 解码
    let arrayBuffer = new ArrayBuffer(byteString.length); //创建缓冲数组
    let intArray = new Uint8Array(arrayBuffer); //创建视图

    for (let i = 0; i < byteString.length; i++) {
        intArray[i] = byteString.charCodeAt(i);
    }
    return new Blob([intArray], {
        type: mimeString
    });
}