图片转成base64

对于更多日常应用的公共类的操作方法，能够关注下小滑轮网站 http://www.feiaci.com/#/self/...

/** * 蒋图片转成base64 * width、height调用时传入具体像素值，管制大小 ,不传则默认图像大小 * 能够会有跨域问题，倡议是同源 * @param imgSrc 图片地址 * @param width  * @param height * @returns {string} */function getBase64Image(imgSrc, width, height) {    return new Promise((resolve) => {        const newImg = new Image();        newImg.setAttribute('crossOrigin', 'anonymous');        newImg.src = imgSrc;        const canvas = document.createElement('canvas');        canvas.width = width || img.width;        canvas.height = height || img.height;        const ctx = canvas.getContext('2d');        newImg.onload = function () {            ctx.drawImage(newImg, 0, 0, canvas.width, canvas.height);            const dataURL = canvas.toDataURL('image/png', 1);            resolve(dataURL);        };    });}