代码
// 转base64
getBase64(imgUrl, callback) {
let image = new Image();
// 解决跨域问题
image.setAttribute("crossOrigin", "anonymous");
let imageUrl = imgUrl;
image.src = imageUrl;
// image.onload为异步加载
// eslint-disable-next-line no-undef
image.onload = function() {
var canvas = document.createElement("canvas");
canvas.width = image.width;
canvas.height = image.height;
var context = canvas.getContext("2d");
// eslint-disable-next-line no-undef
context.drawImage(image, 0, 0, image.width, image.height);
var quality = 0.8;
// 这里的dataurl就是base64类型
// 使用toDataUrl将图片转换成jpeg的格式,不要把图片压缩成png,因为压缩成png后base64的字符串可能比不转换前的长!
let dataurl = canvas.toDataURL("image/jpeg", quality);
callback ? callback(dataurl) : null; //调用回调函数
};
},
传入本地图片的地址 调用获取
this.getBase64('./test.img', dataURL => {
console.log(dataURL );
});