将图像编码为Amazon S3的Base64

Question

我有一个包含图像的iframe。图像源链接到S3存储桶中的图像。我需要在Base64中编码此图像，并将iframe的主体保存在数据库中。

我该怎么做？

Answer 1

试试这个How to access the <img /> in document from iframe?

$('#Iframe1').contents().find('img').css({'width':'100%','height':'90%'}); 

，然后使用此功能从这里Get image data in JavaScript?

function getBase64Image(img) { 
    // Create an empty canvas element 
    var canvas = document.createElement("canvas"); 
    canvas.width = img.width; 
    canvas.height = img.height; 

    // Copy the image contents to the canvas 
    var ctx = canvas.getContext("2d"); 
    ctx.drawImage(img, 0, 0); 

    // Get the data-URL formatted image 
    // Firefox supports PNG and JPEG. You could check img.src to 
    // guess the original format, but be aware the using "image/jpg" 
    // will re-encode the image. 
    var dataURL = canvas.toDataURL("image/png"); 

    return dataURL.replace(/^data:image\/(png|jpg);base64,/, ""); 
}