將圖像編碼爲Amazon S3的Base64

Question

我有一個包含圖像的iframe。圖像源鏈接到S3存儲桶中的圖像。我需要在Base64中編碼此圖像，並將iframe的主體保存在數據庫中。

我該怎麼做？

Answer 1

試試這個How to access the <img /> in document from iframe?

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

，然後使用此功能從這裏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,/, ""); 
}