将图片链接直接转成base64位编码

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 imgLink = "你的链接";
var tempImage = new Image();
tempImage.src = imgLink;
tempImage.crossOrigin = "*";
tempImage.onload = function(){
var base64 = getBase64Image(tempImage);
console.log(base64);
}

image.crossOrigin = "*"

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