* 函数 ~~~ function getImgBase64(path, callback) { var img = new Image(); img.src = path; //图片加载完成后触发 img.onload = function () { var canvas = document.createElement("canvas"); //获取绘画上下文 ctx = canvas.getContext("2d"); // 获取图片宽高 var imgWidth = img.width; var imgHeight = img.height; //设置画布宽高与图片宽高相同 canvas.width = imgWidth; canvas.height = imgHeight; //绘制图片 ctx.drawImage(img, 0, 0, imgWidth, imgHeight); //图片展示的 data URI var dataUrl = canvas.toDataURL('image/jpeg'); callback ? callback(dataUrl) : ''; }; } ~~~ * 调用 ~~~ getImgBase64('wood.png', function (dataUrl) { console.log(dataUrl); }); ~~~