如何將圖像保存爲基本64？

Question

我使用幻象JS來獲取圖像的字符串，然後我編碼它們與基地64

var content = btoa(unescape(encodeURIComponent(imagestring))); 
self.writeFile(pathToFolder + fileTitle, content);  

但不顯示圖像。它說它們已經損壞。 如何保存這樣的圖像？

Answer 1

如果你想保存圖像爲使用JavaScript的base64，你可以用這個代碼嘗試：

var fs = require('fs'); 
 
// string generated by canvas.toDataURL() 
 
var img = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0" 
 
    + "NAAAAKElEQVQ4jWNgYGD4Twzu6FhFFGYYNXDUwGFpIAk2E4dHDRw1cDgaCAASFOffhEIO" 
 
    + "3gAAAABJRU5ErkJggg=="; 
 
// strip off the data: url prefix to get just the base64-encoded bytes 
 
var data = img.replace(/^data:image\/\w+;base64,/, ""); 
 
var buf = new Buffer(data, 'base64'); 
 
fs.writeFile('image.png', buf);