将Base64的字符串转换为二进制数,代码如下:
function dataURItoBlob(dataURI) { // convert base64 to raw binary data held in a string // doesn't handle URLEncoded DataURIs - see SO answer #6850276 for code that does this var byteString = atob(dataURI.split(',')[1]); // separate out the mime component var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0] // write the bytes of the string to an ArrayBuffer var ab = new ArrayBuffer(byteString.length); // create a view into the buffer var ia = new Uint8Array(ab); // set the bytes of the buffer to the correct values for (var i = 0; i < byteString.length; i++) { ia[i] = byteString.charCodeAt(i); } // write the ArrayBuffer to a blob, and you're done var blob = new Blob([ab], {type: mimeString}); return blob; } // 将Base64的字符串转换为二进制数据 var blob = dataURItoBlob(image); // 使用FileSaver.js的saveAs函数进行下载 saveAs(blob, "images.png");
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