js图片转base64

/** * 将图片转换为Base64 */

function image2Base64(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 dataURL = canvas.toDataURL("image/png");

return dataURL;

}

/** * 获取图片Base64编码 */

function getImgBase64()

{

var base64=""; var img = new Image();

img.src="img/test.jpg";

img.onload=function(){

base64 = image2Base64(img);

 }

}

getImgBase64();