var img = "imgurl";//imgurl 就是你的图片路径 ?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.src = img; ?image.onload = function(){ ???var base64 = getBase64Image(image); ???console.log(base64); ?} ?js将图片转换为base64
原文地址：http://www.cnblogs.com/Jerry-MrNi/p/7825536.html