图片 转base64格式
https://www.cnblogs.com/zhangdiIT/p/7895903.html 原地址
function(){
var url = "static/img/js1.jpg";//这是站内的一张图片资源,采用的相对路径
convertImgToBase64(url, function(base64Img){
//转化后的base64
alert(base64Img);
});
}
//实现将项目的图片转化成base64
function convertImgToBase64(url, callback, outputFormat){
var canvas = document.createElement('CANVAS'),
ctx = canvas.getContext('2d'),
img = new Image;
img.crossOrigin = 'Anonymous';
img.onload = function(){
canvas.height = img.height;
canvas.width = img.width;
ctx.drawImage(img,0,0);
var dataURL = canvas.toDataURL(outputFormat || 'image/png');
callback.call(this, dataURL);
canvas = null;
};
img.src = url;
}