base64转pdf（大文件转换是空白文件处理）

解决大文件转换时转出来是空白文件

1.定义一个方法，将base64转为Blob

const b64toBlob = (b64Data, contentType = '', sliceSize = 512) => {
    const byteCharacters = atob(b64Data);
    const byteArrays = [];

    for (let offset = 0; offset < byteCharacters.length; offset += sliceSize) {
        const slice = byteCharacters.slice(offset, offset + sliceSize);

        const byteNumbers = new Array(slice.length);
        for (let i = 0; i < slice.length; i++) {
        byteNumbers[i] = slice.charCodeAt(i);
        }

        const byteArray = new Uint8Array(byteNumbers);
        byteArrays.push(byteArray);
    }

    const blob = new Blob(byteArrays, { type: contentType });
    return blob;
};

2.调用b64toBlob方法，在新标签打开

const openpdf = (data)=>{
    const blob = new Blob([b64toBlob(data.Data)], { type: data.DataType });
    const url = URL.createObjectURL(blob);
    window.open(url);
}