利用canvas方法
var img = "https://img.alicdn.com/bao/uploaded/TB1qimQIpXXXXXbXFXXSutbFXXX.jpg";
function getBase64Image(img) {
var canvas = document.createElement("canvas");
canvas.width = img.width;
canvas.height = img.height;
var ctx = canvas.getContext("2d");
ctx.drawImage(img, 0, 0, img.width, img.height);
var ext = img.src.substring(img.src.lastIndexOf(".") + 1).toLowerCase();
var dataURL = canvas.toDataURL("image/" + ext);
return dataURL;
}
var image = new Image();
image.crossOrigin = 'anonymous';//解決Canvas.toDataURL 圖片跨域問題
image.src = img;
image.onload = function () {
var base64 = getBase64Image(image);
console.log(base64);
}
